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A127128 Column 1 of triangle A127126. 11
1, 2, 9, 54, 412, 3834, 42131, 533558, 7645065, 122177706, 2153221318, 41464853266, 865908079369, 19484990264956, 469910189792853, 12089047867952058, 330423404118495975, 9561012695542004496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Convolution square of A127131.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..80

MATHEMATICA

T[n_, k_]:= T[n, k]= If[k==n, 1, Coefficient[(1 +x*Sum[x^(r-k-1)*Sum[T[r, c], {c, k+1, r}], {r, k+1, n}] + x^(n+1))^(k+1), x, n-k]]; Table[T[n, 1], {n, 1, 20}] (* G. C. Greubel, Jan 28 2020 *)

CROSSREFS

Cf. A127126; A127131; other columns: A127127, A127129, A127130.

Sequence in context: A307442 A222014 A321974 * A254795 A064151 A075679

Adjacent sequences:  A127125 A127126 A127127 * A127129 A127130 A127131

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 05 2007

STATUS

approved

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Last modified July 13 15:18 EDT 2020. Contains 335688 sequences. (Running on oeis4.)