A321380 Expansion of 1/2 * Product_{i>=0, j>=0} (1 + x^(i^2 + j^2)).

1, 2, 2, 2, 3, 6, 8, 8, 8, 12, 19, 22, 22, 26, 37, 48, 53, 58, 72, 92, 108, 118, 136, 166, 195, 222, 254, 298, 346, 394, 453, 524, 600, 672, 762, 884, 1011, 1126, 1255, 1438, 1652, 1850, 2047, 2302, 2626, 2960, 3274, 3636, 4095, 4602, 5112, 5662, 6319, 7056, 7834

Offset

0,2

Links

Vaclav Kotesovec, Table of n, a(n) for n = 0..10000

Formula

G.f.: Product_{k>0} (1 + x^k)^A000925(k).

Crossrefs

Cf. A000925, A033461, A321381.

Sequence in context: A096235 A147851 A367088 * A218694 A143596 A342763

Adjacent sequences: A321377 A321378 A321379 * A321381 A321382 A321383

Keyword

nonn

Author

Seiichi Manyama, Nov 08 2018

Status

approved