|
|
A193468
|
|
a(n) = A193466(n)/n for n>=1.
|
|
1
|
|
|
1, 1, 3, 21, 193, 2125, 32281, 655235, 15530705, 427214889, 14127457681, 542796582295, 23400843532969, 1140401734145453, 62743287535847465, 3822548966261363595, 256275705820386124321, 18923726002188870476497
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
A193466 is defined by the e.g.f.: Sum_{n>=0} x^n * Product_{k=1..n} cosh(k*x).
|
|
LINKS
|
|
|
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
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|