A127086 Column 3 of triangle A127082.

1, 4, 26, 192, 1551, 13416, 122770, 1180496, 11883079, 124992672, 1372811900, 15741602608, 188470662702, 2356327731016, 30760057620142, 419124712458444, 5956905826561685, 88230307480324360, 1360309585677285312

Offset: 3

Author

Paul D. Hanna, Jan 04 2007

Keywords

• nonn

Comments

Convolution 4th power of A127089.

Links

• G. C. Greubel, Table of n, a(n) for n = 3..80

Crossrefs

Cf. A127082.

Columns of A127082: A127083, A127084, A127085.

Cf. A127087, A127088, 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]]; Table[T[n, 3], {n,3,25}] (* G. C. Greubel, Jan 30 2020 *)