OFFSET
0,3
FORMULA
a(n) = Sum_{k=0..n} (2*n+2*k)!/(2*n+k+1)! * |Stirling1(n,k)|.
PROG
(PARI) a(n) = sum(k=0, n, (2*n+2*k)!/(2*n+k+1)!*abs(stirling(n, k, 1)));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 25 2024
STATUS
approved