OFFSET
1,3
COMMENTS
A193466 is defined by the e.g.f.: Sum_{n>=0} x^n * Product_{k=1..n} cosh(k*x).
PROG
(PARI) {a(n)=local(X=x+x*O(x^n), Egf); Egf=sum(m=0, n, x^m*prod(k=1, m, cosh(k*X))); if(n<1, 0, (n-1)!*polcoeff(Egf, n))}
CROSSREFS
KEYWORD
nonn,changed
AUTHOR
Paul D. Hanna, Jul 27 2011
STATUS
approved