OFFSET
0,3
FORMULA
E.g.f. A(x) satisfies A(x) = exp( x * A(x) * cosh(x * A(x)) ).
a(n) = Sum_{k=0..n} (n+1)^(k-1) * A185951(n,k).
PROG
(PARI) a185951(n, k) = binomial(n, k)/2^k*sum(j=0, k, (2*j-k)^(n-k)*binomial(k, j));
a(n) = sum(k=0, n, (n+1)^(k-1)*a185951(n, k));
CROSSREFS
KEYWORD
nonn,new
AUTHOR
Seiichi Manyama, Feb 15 2025
STATUS
approved