A203520 v(n)/A000178(n); v=A203518 and A000178=(superfactorials).

1, 3, 30, 1680, 900900, 9535125600, 4122929827336320, 161481256755920962660800, 1289130207153926967849156327590400, 4850265693548396005370498087328884780717568000, 20141097979706537636828034511787661382412368790843921121216000

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: A335710 A341499 A203415 * A238767 A323819 A308228

Adjacent sequences: A203517 A203518 A203519 * A203521 A203522 A203523

Keyword

nonn

Author

Clark Kimberling, Jan 03 2012

Status

approved