OFFSET
0,2
FORMULA
Convolution inverse of A292318.
a(n) ~ -2 * n! * (1 - 2/n - 2/n^2 - 8/n^3 - 42/n^4 - 306/n^5 - 2812/n^6 - 30246/n^7 - 368710/n^8 - 5015300/n^9 - 75279670/n^10). - Vaclav Kotesovec, Sep 15 2017
MATHEMATICA
nmax = 25; CoefficientList[Series[Product[(1 - k!*x^k)/(1 + k!*x^k), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Sep 15 2017 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Sep 14 2017
STATUS
approved