-3680

Appears in sequences

• Expansion of e.g.f. cos(x)/cosh(tan(x)), even powers only.at n=5A009110
• a(n) = 4^n - n^5.at n=6A024041
• Sum_{k=1..n-1} J(2*n,k)*k^2, where J(i,j) is the Jacobi symbol.at n=45A097543
• Sum_{k=1..2n-1} J(4*n,k)*k^2, where J(i,j) is the Jacobi symbol.at n=22A097544
• Coefficient of x^(3n)/(3n)! in the Maclaurin expansion of the Dixon elliptic function cm(x,0).at n=3A104134
• Triangle of coefficients of the Pascal sum of A053120 Chebyshev's T(n, x) polynomials :p(x,n)=2*x*p(x,n-1)-p(x,n-2); pp(x,n)=Sum[Binomial[n,m]*p(x,m),{m,0,n}].at n=61A136663
• Numerator of Hermite(n, 8/9).at n=3A159245
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of max{3i+j-3,i+3j-3} (A204008).at n=21A204011
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 155", based on the 5-celled von Neumann neighborhood.at n=37A270328
• G.f.: (1 - x/(1 - x^2/(1 - x^3/(1 - x^4/(1 - ...))))) * (1 + x/(1 + x^2/(1 + x^3/(1 + x^4/(1 + ...))))), a continued fraction.at n=29A285638
• Values z of primitive solutions (x, y, z) to the Diophantine equation x^3 + y^3 + 2*z^3 = 128.at n=36A336230
• a(n) = Sum_{k=0..floor(n/2)} A323833(n,k) if A323833 is read as a triangle.at n=8A342195
• Expansion of Product_{k>=1} (1 - x^k)^Fibonacci(k).at n=27A357179