A300147 a(n) = (1/8) * Sum_{d|n} d * A110163(d).

-30, 6660, -1536120, 354476040, -81800478900, 18876653594640, -4356063194112240, 1005225129672310800, -231970363216834560390, 53530545369975222475800, -12352954264801690636800360, 2850624405442199478575792160

Offset

1,1

Links

Vaclav Kotesovec, Table of n, a(n) for n = 1..420

Formula

a(n) ~ (-1)^n * exp(Pi*sqrt(3)*n) / 8. - Vaclav Kotesovec, Jun 07 2018

Crossrefs

Cf. A004009 (E_4), A108091, A110163, A289247, A300025.

Sequence in context: A169686 A184889 A358481 * A087216 A239925 A059049

Adjacent sequences: A300144 A300145 A300146 * A300148 A300149 A300150

Keyword

sign

Author

Seiichi Manyama, Feb 26 2018

Status

approved