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

Author

Clark Kimberling, Jan 05 2012

Keywords

• nonn

Comments

See A093883 for a discussion and guide to related sequences.

Programs

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 *)