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A203525
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a(n) = v(n+1)/(8*v(n)), where v=A203524.
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3
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1, 15, 504, 17280, 1108800, 59304960, 5613753600, 944393748480, 83547459072000, 18057977118720000, 2985679725841612800, 366843845931171840000, 71218197373471948800000, 22048551163610844364800000, 7384118713322835982417920000
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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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MATHEMATICA
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f[j_] := Prime[j + 1]; z = 17;
v[n_] := Product[Product[f[k] + f[j], {j, 1, k - 1}], {k, 2, n}]
d[n_] := Product[(i - 1)!, {i, 1, n}] (* A000178 *)
Table[v[n], {n, 1, z}] (* A203524 *)
Table[v[n + 1]/(8 v[n]), {n, 1, z - 1}] (* A203525 *)
Table[v[n]/d[n], {n, 1, 20}] (* A203526 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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