A369358 a(n) is the constant term in expansion of Product_{k=1..n} (x^(k^4) + 1 + 1/x^(k^4)).

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 15, 25, 59, 109, 227, 525, 1321, 2917, 7085, 15893, 38759, 90179, 223933, 534867, 1339691, 3246961, 8296441, 20426971, 52715563, 131480623, 342491253, 864759837, 2270860455, 5793103989, 15316065497, 39429185075, 105008858223

Offset

0,10

Links

Table of n, a(n) for n=0..37.

Mathematica

Table[Coefficient[Product[x^(k^4) + 1 + 1/x^(k^4), {k, 1, n}], x, 0], {n, 0, 25}]

Crossrefs

Cf. A000583, A007576, A158465, A350249.

Sequence in context: A208229 A269956 A153512 * A127328 A002891 A089875

Adjacent sequences: A369355 A369356 A369357 * A369359 A369360 A369361

Keyword

nonn

Author

Ilya Gutkovskiy, Jan 21 2024

Extensions

a(26)-a(37) from Alois P. Heinz, Jan 21 2024

Status

approved