564736653

Appears in sequences

• Expansion of g.f. (1-4*x)/(1-13*x).at n=8A196663
• Inverse permutation to A328618.at n=38A328619
• Triangle read by rows. T(n, k) = [x^k] P(n, x), where P(n, x) = Sum_{k=0..n} 2^(n - k) * Sum_{j=0..k} (x^j * binomial(k, j) * (2*j + 1)^n), (secant case).at n=34A363398
• a(n) is the least k that is a multiple of d=A240991(n), with abundancy ratio sigma(k)/k equal to (sigma(d)+1)/d, or -1 if no such k exists.at n=32A387405