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A127130
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Column 3 of triangle A127126.
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10
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1, 4, 30, 284, 3217, 42100, 621936, 10206956, 183946656, 3608229588, 76499111202, 1742909621024, 42465280193704, 1101811478508828, 30331386700718440, 883010853509597608, 27105284242369828508, 874996700615422755068
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OFFSET
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3,2
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COMMENTS
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Self-convolution 4th power of A127133.
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LINKS
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G. C. Greubel, Table of n, a(n) for n = 3..80
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MATHEMATICA
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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, 3], {n, 3, 20}] (* G. C. Greubel, Jan 28 2020 *)
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CROSSREFS
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Cf. A127126; A127133; other columns: A127127, A127128, A127129.
Sequence in context: A274665 A212073 A172392 * A052631 A301334 A167139
Adjacent sequences: A127127 A127128 A127129 * A127131 A127132 A127133
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna, Jan 05 2007
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STATUS
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approved
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