A127088 Convolution cube-root of column 2 (A127085) of triangle A127082.

1, 1, 4, 20, 117, 770, 5581, 44023, 375118, 3434312, 33632306, 350894959, 3885892547, 45520247052, 562266198499, 7301972285296, 99436168734138, 1416444089850373, 21059162813775906, 326127491494213657

Offset: 0

Author

Paul D. Hanna, Jan 04 2007

Keywords

• nonn

Links

• G. C. Greubel, Table of n, a(n) for n = 0..80

Crossrefs

Cf. A127082, A127083, A127084, A127085, A127086, A127087, A127089, A127090, A127091.

Programs

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]]; CoefficientList[Series[ (Sum[T[n, 2]*x^n, {n,0,25}]/x^2)^(1/3), {x,0,20}], x] (* G. C. Greubel, Jan 30 2020 *)