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A375990
Expansion of e.g.f. (1 + 2 * log(1 - x))^2.
1
1, -4, 4, 16, 64, 304, 1712, 11232, 84384, 715392, 6761088, 70513920, 804683520, 9975536640, 133513989120, 1919012014080, 29482606540800, 482183099596800, 8364495012249600, 153406409645260800, 2965940772905779200, 60291976261386240000
OFFSET
0,2
FORMULA
a(n) = -4 * (n-1)! + 8 * |Stirling1(n,2)| for n > 0.
PROG
(PARI) a(n) = if(n==0, 1, -4*(n-1)!+8*abs(stirling(n, 2, 1)));
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Seiichi Manyama, Sep 05 2024
STATUS
approved