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A203525 v(n+1)/(8*v(n)), where v=A203521. 3
1, 15, 504, 17280, 1108800, 59304960, 5613753600, 944393748480, 83547459072000, 18057977118720000, 2985679725841612800, 366843845931171840000, 71218197373471948800000, 22048551163610844364800000, 7384118713322835982417920000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

MATHEMATICA

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 *)

CROSSREFS

Cf. A203524, A203526, A000040, A093883, A203315.

Sequence in context: A218226 A208099 A219057 * A249962 A004703 A218188

Adjacent sequences:  A203522 A203523 A203524 * A203526 A203527 A203528

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 03 2012

STATUS

approved

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Last modified July 10 16:22 EDT 2020. Contains 335577 sequences. (Running on oeis4.)