56538
domain: N
Appears in sequences
- a(n) = n*(6*n^2 - 7*n + 3)/2.at n=27A071230
- Expansion of Product_{k>=1} 1/(1 - psi(k)*x^k), where psi() is the Dedekind psi function (A001615).at n=15A306483
- Expansion of Sum_{k>0} (1/(1-x^k)^6 - 1).at n=19A363696
- Number of subsets of {1,2,...,n} such that no two elements differ by 2, 3, or 5.at n=31A375982