A347900 E.g.f.: Product_{k>=1} (1 + x^k)^(tan(x)/k).

1, 0, 2, 0, 36, -30, 1384, -1680, 95120, -269136, 10673176, -39346560, 1646512480, -9198926880, 351447935136, -2475812561040, 99060435898112, -904912972938240, 34772619691749120, -378998950170136320, 14965802767502028672, -197854178189523770880, 7940955462403332290816

Offset: 0

Author

Seiichi Manyama, Sep 18 2021

Keywords

• sign

Crossrefs

Cf. A347898, A347899.

Programs

PARI

N=40; x='x+O('x^N); Vec(serlaplace(prod(k=1, N, (1+x^k)^(tan(x)/k))))