A127085 Column 2 of triangle A127082.

1, 3, 15, 85, 531, 3600, 26266, 205353, 1716582, 15321056, 145819266, 1477589301, 15908557455, 181553715486, 2190398368254, 27859946518796, 372542199781464, 5223365137285467, 76597458027515272, 1172078722366916586

Offset

2,2

Comments

Convolution cube of A127088.

Links

G. C. Greubel, Table of n, a(n) for n = 2..80

Mathematica

T[n_, k_]:= T[n, k]= If[k==n, 1, Coefficient[(1 + x*Sum[x^(r-k)*Sum[T[r, c], {c, k, r}], {r, k, n-1}] + x^(n+1))^(k+1), x, n-k]]; Table[T[n, 2], {n, 2, 25}] (* G. C. Greubel, Jan 30 2020 *)

Crossrefs

Cf. A127082.

Columns of A127082: A127083, A127084, A127086.

Cf. A127087, A127088, A127089, A127090, A127091.

Sequence in context: A084209 A317133 A182016 * A326275 A093615 A191148

Adjacent sequences: A127082 A127083 A127084 * A127086 A127087 A127088

Keyword

nonn

Author

Paul D. Hanna, Jan 04 2007

Status

approved