-1664
domain: Z
Appears in sequences
- McKay-Thompson series of class 20D for Monster.at n=33A058553
- Matrix inverse of triangle A111553.at n=15A111559
- Matrix inverse of triangle A111553.at n=22A111559
- Matrix inverse of triangle A111553.at n=30A111559
- Matrix inverse of triangle A111553.at n=39A111559
- Matrix inverse of triangle A111553.at n=49A111559
- Matrix inverse of triangle A122177, where A122177(n,k) = C( k*(k+1)/2 + n-k + 2, n-k) for n>=k>=0.at n=32A121437
- Hankel transform of A127275.at n=7A127276
- a(n) = numerator of r(n): r(n) is such that, for every positive integer n, the continued fraction (of rational terms) [r(1);r(2),...,r(n)] equals n(n+1)/2, the n-th triangular number.at n=6A128536
- Expansion of (eta(q)^2 * eta(q^4)^4 / eta(q^2)^3)^2 in powers of q.at n=39A138501
- a(n) = (1-2n)*2^n.at n=7A143126
- Convolution square of A255528.at n=25A278710
- a(n) = 4^n*hypergeom([-n/4, (1-n)/4, (2-n)/4, (3-n)/4], [1, 1, 1], -1).at n=6A294037
- G.f.: x / (Sum_{k>=1} k * x^k / (1 + x^k)).at n=14A335227
- Alternating row sums of A352366.at n=9A352368
- Numerators of Dirichlet inverse of fraction A003961(n) / sigma(n).at n=31A354827