A203533 v(n)/A000178(n); v=A203527 and A000178=(superfactorials).

1, 10, 840, 464100, 1481407200, 32851686067200, 5186361382800998400, 4436556151786001058816000, 19667253420867342693731328000000, 605862171333980479840975997239296000000, 132207384898194165523202154782408753283072000000

Offset

1,2

Comments

It is conjectured that every term of A203533 is an integer.

Links

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

Mathematica

t = Table[If[PrimeQ[k], 0, k], {k, 1, 100}];
composite = Rest[Rest[Union[t]]]       (* A002808 *)
f[j_] := composite[[j]]; z = 20;
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}]                 (* A203530 *)
Table[v[n + 1]/v[n], {n, 1, z - 1}]    (* A203532 *)
Table[v[n]/d[n], {n, 1, 20}]           (* A203533 *)

Crossrefs

Cf. A203530, A203532, A002808, A093883, A203420.

Sequence in context: A013437 A246599 A006714 * A015033 A126677 A370223

Adjacent sequences: A203530 A203531 A203532 * A203534 A203535 A203536

Keyword

nonn

Author

Clark Kimberling, Jan 03 2012

Status

approved