80920

Appears in sequences

• Expansion of Product_{k>=1} (1 - x^k)^20.at n=19A010826
• Numbers k such that core(k) = b(k,1)*b(k,0) where b(k,1) is the number of 1's in binary representation of k, b(k,0) the number of 0's and core(k) the squarefree part of k.at n=7A071639
• Triangle read by rows: T(n,k) = binomial(2n+1, n-k)*Fibonacci(2k+1), 0 <= k <= n.at n=40A103245
• Molecular topological indices of the complete graph K_n.at n=34A181617
• a(n) = (n-1)*(n-2)*(n^2+9*n+12)/24.at n=36A323847
• Expansion of e.g.f. exp(x^3/(6 * (1-x))).at n=9A361533
• a(n) = 2*n*binomial(n, 4).at n=16A391978