-608

Appears in sequences

• Image of Euler totient function (A000010) under "little Hankel" transform that sends [c_0, c_1, ...] to [d_0, d_1, ...] where d_n = c_n^2 - c_{n+1}*c_{n-1}.at n=42A056228
• McKay-Thompson series of class 24D for the Monster group.at n=66A058574
• Sum at 45 degrees to horizontal in triangle of A081498.at n=36A081499
• Triangle of Salie numbers T(n,k) for negative n,k, n < k.at n=15A098435
• McKay-Thompson series of class 24h for the Monster group.at n=66A112165
• Partial sums of (-1)^n*Fibonacci(n-1).at n=17A112469
• Hankel transform of A127275.at n=6A127276
• Inverse of number triangle A127967.at n=55A127969
• Triangle read by rows of coefficients of Chebyshev-like polynomials P_{n,5}(x) with 0 omitted (exponents in increasing order).at n=30A136397
• Triangular sequence from coefficients of characteristic polynomial of n X n prime element matrices: M=A.B.A^(-1); (A(3) is singular): examples; A(4)= {{2, 3, 5, 7, 11}, {3, 5, 7, 11, 13}, {5, 7, 11, 13, 17}, {7, 11, 13, 17, 19}, {11, 13, 17, 19, 23}} B(4)= {{3, 5, 7, 11, 13}, {5, 7, 11, 13, 17}, {7, 11, 13, 17, 19}, {11, 13, 17, 19, 23}, {13, 17, 19, 23, 29}}.at n=18A137405
• A triangular sequence based on concepts of operations on existing sequences: in this case the H(x,n) ( A060821) traditional Hermite is differentiated twice : p(x,n)=-x^2*H''(x,n)+H(x,n).at n=20A137449
• Totally multiplicative sequence with a(p) = p*(p-3) = p^2-3p for prime p.at n=37A167341
• Expansion of (1 - 2*x^2)/(1 + x)^4. Third column of Riordan triangle A248156.at n=18A248159
• Expansion of phi(-x^3) / f(-x^2) in powers of x where phi(), f() are Ramanujan theta functions.at n=37A256636
• Expansion of (eta(q)^2 * eta(q^2) * eta(q^4)^3 / eta(q^8)^2)^2 in powers of q.at n=27A259491
• Expansion of chi(-q) * chi(q^9) / (chi(q) * chi(-q^9)) in powers of q where chi() is a Ramanujan theta function.at n=23A260215
• Expansion of (phi(q) / phi(q^3))^2 in powers of q where phi() is a Ramanujan theta function.at n=23A261321
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 185", based on the 5-celled von Neumann neighborhood.at n=17A270637
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 229", based on the 5-celled von Neumann neighborhood.at n=15A270949
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 302", based on the 5-celled von Neumann neighborhood.at n=51A271159