A321423 Expansion of 1/2 * Product_{0 <= i <= j} (1 + x^(i^2 + j^2)).

1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4, 4, 4, 5, 6, 7, 7, 8, 10, 11, 12, 12, 14, 16, 17, 20, 22, 25, 27, 29, 33, 36, 39, 41, 46, 52, 56, 60, 65, 72, 79, 84, 91, 100, 109, 118, 125, 136, 147, 158, 172, 185, 201, 215, 232, 251, 269, 287, 306, 331, 357, 381, 406, 436, 469, 503

Offset

0,6

Links

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Formula

G.f.: Product_{k>0} (1 + x^k)^A000161(k).

Crossrefs

Cf. A000161, A321380, A321424.

Sequence in context: A280168 A001156 A199119 * A035451 A363337 A304633

Adjacent sequences: A321420 A321421 A321422 * A321424 A321425 A321426

Keyword

nonn

Author

Seiichi Manyama, Nov 09 2018

Status

approved