A348024 a(n) = [x^n] Product_{k=1..2*n} (x + (-1)^k * k).

1, 1, -13, -87, 2609, 34965, -1638841, -33411007, 2128380881, 58501278297, -4709853961605, -163166745402375, 15875893807564465, 664163782026582877, -75766955207796981345, -3716140360596415682175, 486265092408065178623265, 27363821966293458296896305, -4039473192629570940395992765

Offset

0,3

Links

Seiichi Manyama, Table of n, a(n) for n = 0..350

Formula

a(n) = A047991(2*n,n).

Prog

(PARI) a(n) = polcoef(prod(k=1, 2*n, x+(-1)^k*k), n);

Crossrefs

Cf. A047991, A129505, A348023.

Sequence in context: A322720 A082036 A037060 * A000836 A157771 A289137

Adjacent sequences: A348021 A348022 A348023 * A348025 A348026 A348027

Keyword

sign

Author

Seiichi Manyama, Sep 25 2021

Status

approved