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A203520 v(n)/A000178(n); v=A203518 and A000178=(superfactorials). 3
1, 3, 30, 1680, 900900, 9535125600, 4122929827336320, 161481256755920962660800, 1289130207153926967849156327590400, 4850265693548396005370498087328884780717568000, 20141097979706537636828034511787661382412368790843921121216000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It is conjectured that every term of A203520 is an integer.

LINKS

Table of n, a(n) for n=1..11.

MATHEMATICA

f[j_] := Fibonacci[j + 1]; z = 15;

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}]                (* A203518 *)

Table[v[n + 1]/v[n], {n, 1, z - 1}]   (* A203519 *)

Table[v[n]/d[n], {n, 1, 20}]          (* A203520 *)

CROSSREFS

Cf. A203518, A000045, A000178, A093883.

Sequence in context: A012008 A335710 A203415 * A238767 A323819 A308228

Adjacent sequences:  A203517 A203518 A203519 * A203521 A203522 A203523

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 03 2012

STATUS

approved

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Last modified August 10 02:02 EDT 2020. Contains 336365 sequences. (Running on oeis4.)