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A203687
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Vandermonde sequence using x^2 - x*y + y^2 applied to (1,2,6,...,n!).
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3
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1, 3, 2604, 358528427712, 12031987952968690199349362688, 370754012130869137189065686833099372581714820267297996800, 84815080863788633556908198622861272366206888854108620395778065239463085651541566677024367443968000000
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OFFSET
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1,2
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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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Table of n, a(n) for n=1..7.
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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 *)
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CROSSREFS
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Cf. A203685, A203688, A203689.
Sequence in context: A289650 A352600 A171361 * A034316 A247838 A003534
Adjacent sequences: A203684 A203685 A203686 * A203688 A203689 A203690
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KEYWORD
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nonn,easy
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AUTHOR
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Clark Kimberling, Jan 04 2012
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EXTENSIONS
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Definition corrected by Georg Fischer, Nov 25 2021
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STATUS
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approved
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