OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..328
FORMULA
a(1) = 1; a(n+1) = 2 * Sum_{k=1..n} Stirling1(n,k) * a(k).
PROG
(PARI) a_vector(n) = my(v=vector(n)); v[1]=1; for(i=1, n-1, v[i+1]=2*sum(j=1, i, stirling(i, j, 1)*v[j])); v;
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jun 24 2022
STATUS
approved