-452

Appears in sequences

• McKay-Thompson series of class 20d for Monster.at n=25A058559
• First order recursion: a(0)=1; a(n) = sigma(1,n) - a(n-1).at n=49A083238
• G.f.: -(2+7*x-x^3)/(1+4*x-4*x^3-x^4).at n=6A097949
• Triangle, read by rows, where T(0,0) = 1, T(n,k) = (-1)^n*(2n+1)*T(n-1,k) - T(n-1,k-1).at n=42A108083
• Determinants of 3 X 3 matrices of continuous blocks of 9 consecutive semiprimes.at n=7A118781
• Series expansion of the elliptic function sqrt(k) = theta_2/theta_3 in powers of q^(1/4).at n=37A127391
• Expansion of the elliptic function sqrt(k(q))/q^(1/4) in powers of q, where sqrt(k(q)) = theta_2(q)/theta_3(q).at n=9A127392
• A triangle of matrix polynomials: m(n)=antisymmeticmatix(n).Transpose[antisymmeticmatix(n)].at n=24A158335
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of f(i,j) = gcd(i+1, j+1) (A204030).at n=32A204111
• Expansion of phi(q) / phi(q^4) in powers of q where phi() is a Ramanujan theta function.at n=37A208274
• Choose smallest m>0 such that the n-th rational prime p ramifies in the imaginary quadratic extension field K = Q(sqrt(-m)); a(n) = discriminant(K).at n=29A220861
• Expansion of phi(x) / phi(x^2) * f(-x, -x^7) / f(-x^3, -x^5) in powers of x where phi(), f() are Ramanujan theta functions.at n=18A230534
• Expansion of q * (f(-q, -q^7) / f(-q^3, -q^5))^2 in powers of q where f(,) is Ramanujan's two-variable theta function.at n=36A230535
• Expansion of (phi(x) / phi(x^2)) * (f(-x^3, -x^5) / f(-x^1, -x^7)) in powers of x where phi(), f() are Ramanujan theta functions.at n=19A245434
• Expansion of q^(-1) * (f(-q^3, -q^5) / f(-q, -q^7))^2 in powers of x where f(,) is Ramanujan's two-variable theta function.at n=38A245436
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 131", based on the 5-celled von Neumann neighborhood.at n=13A270224
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 158", based on the 5-celled von Neumann neighborhood.at n=50A270336
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 390", based on the 5-celled von Neumann neighborhood.at n=31A271601
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 414", based on the 5-celled von Neumann neighborhood.at n=38A272015
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 525", based on the 5-celled von Neumann neighborhood.at n=44A272741