OFFSET
0,2
FORMULA
a(n) = (2*n)! * [x^(2*n)] 1/(1 - x)^log(1 + x).
MATHEMATICA
nmax = 15; Table[(CoefficientList[Series[1/(1 - x)^Log[1 + x], {x, 0, 2 nmax}], x] Range[0, 2 nmax]!)[[n]], {n, 1, 2 nmax + 1, 2}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jun 06 2019
STATUS
approved