OFFSET
3,1
LINKS
Andrew Howroyd, Table of n, a(n) for n = 3..50
PROG
(PARI) seq(n)={Vec(serlaplace(sum(k=1, n, k*binomial(k-1, 2)*2^binomial(k-1, 2)*x^k/k!)/sum(k=0, n, 2^binomial(k, 2)*x^k/k!) + O(x*x^n)))} \\ Andrew Howroyd, Nov 23 2020
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Christian G. Bower, Jan 04 1999; suggested by Vlady Ravelomanana
EXTENSIONS
Terms a(12) and beyond corrected by Andrew Howroyd, Nov 23 2020
STATUS
approved