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A127084
Column 1 of triangle A127082.
10
1, 2, 7, 28, 127, 650, 3737, 23996, 170866, 1338578, 11446714, 106063630, 1057817614, 11288886056, 128243813228, 1543828592478, 19616461337281, 262178561430244, 3674568043513202, 53861542554953612, 823710227331537712
OFFSET
1,2
COMMENTS
Convolution square of A127087.
LINKS
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, 1], {n, 1, 25}] (* G. C. Greubel, Jan 30 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jan 04 2007
STATUS
approved