45640

Appears in sequences

• a(n) = (2*n^3 + 5*n^2 - 17*n)/2.at n=34A162259
• a(n) = n*(n+1)*(3*n^2+5*n+4)/12.at n=20A176060
• Number of nonempty subsets of {1, 2, ..., n} with <=6 pairwise coprime elements.at n=35A187267
• Number of 4-step self-avoiding walks on an n X n square summed over all starting positions.at n=36A188149
• Principal diagonal of the convolution array A213828.at n=19A213829
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic residues mod p that are < p/2.at n=38A282721
• Triangle read by rows, coefficients of polynomials in t = log(x) of the n-th derivative of x^(x^2), evaluated at x = 1. T(n, k) with n >= 0 and 0 <= k <= n.at n=31A293473
• Nonunitary weird numbers: numbers that are nonunitary abundant but not nonunitary pseudoperfect.at n=11A327948
• Number of symmetric 0-1 matrices with nondecreasing row sums.at n=6A351288