OFFSET
0,4
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..340
FORMULA
a(n) ~ c * 4^n * n^(n - 3/4 - 3/8*log(2)) / (exp(n) * (log(2))^n), where c = 0.137369844026491686111562...
PROG
(PARI) {a(n)=local(A=1+x); for(i=1, n, A = 2*A - (1-x + A^3 - subst(A, x, x*A^4 +x*O(x^n))) ); polcoeff(A, n)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Aug 11 2014
EXTENSIONS
Name corrected by Vaclav Kotesovec and Paul D. Hanna, Aug 15 2014
STATUS
approved