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A369433
a(n) = [x^n] Product_{k=1..n} (x^(k^2) + 1 + 1/x^(k^2)).
3
1, 1, 0, 1, 3, 5, 7, 13, 35, 82, 168, 409, 1035, 2540, 6262, 16068, 41474, 107259, 279256, 736359, 1953946, 5205746, 13938670, 37567522, 101675407, 276158642, 752927255, 2060852216, 5658658210, 15582628517, 43032891276, 119166025289, 330808837377
OFFSET
0,5
MATHEMATICA
Table[Coefficient[Product[(x^(k^2) + 1 + 1/x^(k^2)), {k, 1, n}], x, n], {n, 0, 32}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jan 23 2024
STATUS
approved