OFFSET
0,2
COMMENTS
Central terms of the triangle in A155955;
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..200
FORMULA
a(n) = n! * [x^n] 1/(1 + LambertW(-2*n*x)). - Ilya Gutkovskiy, Oct 03 2017
MATHEMATICA
Table[If[n==0, 1, (2*n^2)^n], {n, 0, 30}] (* G. C. Greubel, Sep 14 2018 *)
PROG
(PARI) vector(30, n, n--; (2*n^2)^n) \\ G. C. Greubel, Sep 14 2018
(Magma) [(2*n^2)^n: n in [0..30]]; // G. C. Greubel, Sep 14 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jan 31 2009
STATUS
approved