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A203688
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v(n+1)/v(n), where v=A203687.
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2
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3, 868, 137683728, 33559369419469824, 30814027871378630714538393600, 228763757339598304909903916639768291573760000, 26160851477909352213716196682766580796112417641624416288768000000
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OFFSET
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1,1
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COMMENTS
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See A093883 for a discussion and guide to related sequences.
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LINKS
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FORMULA
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a(n) ~ (n+1)!^(2*n).
a(n) ~ (2*Pi)^n * n^(2*n^2 + 3*n) / exp(2*n^2 - 13/6). (End)
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MATHEMATICA
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f[j_] := j!; z = 8;
u[n_] := Product[f[j]^2 - f[j] f[k] + f[k]^2,
{j, 1, k - 1}]
v[n_] := Product[u[n], {k, 2, n}]
Table[v[n], {n, 1, z}] (* A203687 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203688 *)
Table[Product[k!^2 - k!*(n+1)! + (n+1)!^2, {k, 1, n}], {n, 1, 10}] (* Vaclav Kotesovec, Nov 21 2023 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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