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A127132 Self-convolution cube-root of column 2 (A127129) of triangle A127126. 7
1, 1, 5, 36, 336, 3793, 49691, 736301, 12130141, 219488417, 4322334090, 91974793971, 2102457339356, 51377007363853, 1336508757460743, 36876168645675673, 1075680625224925835, 33076997985647151025 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..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]]; CoefficientList[Series[ (Sum[T[n, 2]*x^n, {n, 0, 22}]/x^2)^(1/3), {x, 0, 20}], x] (* G. C. Greubel, Jan 28 2020 *)

CROSSREFS

Cf. A127126, A127127, A127128, A127129, A127130, A127131, A127133, A127134, A127135.

Sequence in context: A067305 A000806 A278990 * A141764 A075744 A277610

Adjacent sequences:  A127129 A127130 A127131 * A127133 A127134 A127135

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 05 2007

STATUS

approved

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Last modified October 15 20:17 EDT 2021. Contains 348034 sequences. (Running on oeis4.)