OFFSET
0,3
FORMULA
a(n) = Sum_{k=0..n} Sum_{j=0..k} (-1)^j*binomial(2*k,j)*(k-j)^(2*n) / (k!)^2.
MAPLE
PROG
(PARI) a(n) = sum(k=0, n, sum(j=0, k, (-1)^j*binomial(2*k, j)*(k-j)^(2*n)) / (k!)^2); \\ Michel Marcus, May 11 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, May 11 2018
STATUS
approved