A203770 Vandermonde sequence using x^4 + y^4 applied to (1,1,2,2,...,floor(n/2)).

1, 2, 578, 5345344, 338179153563904, 3466035612421233748051968, 1923520756594004458835713813690433667072, 546551001653798242379097661463711497556444294267384365056

Offset

1,2

Comments

See A093883 for a discussion and guide to related sequences.

Links

Table of n, a(n) for n=1..8.

Mathematica

f[j_] := Floor[(j + 1)/2]; z = 16;
u := Product[f[j]^4 + f[k]^4, {j, 1, k - 1}]
v[n_] := Product[u, {k, 2, n}]
Table[v[n], {n, 1, z}]          (* A203770 *)
Table[v[n + 1]/v[n], {n, 1, z}] (* A203771 *)

Crossrefs

Sequence in context: A212840 A129697 A214911 * A121850 A291320 A100011

Adjacent sequences: A203767 A203768 A203769 * A203771 A203772 A203773

Keyword

nonn

Author

Clark Kimberling, Jan 05 2012

Status

approved