OFFSET
1,2
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 1..296
FORMULA
a(n) ~ (-1)^n * c * (42/log(7))^n * n! / n^(5/7 + 2*log(7)/3), where c = 0.0333062243645475214012...
PROG
(PARI) {a(n) = my(A=x, V=[1, 6]); for(i=1, n, V = concat(V, 0); A=x*Ser(V); V[#V] = Vec( subst(A, x, 8*x - 7*A) )[#V]/6 ); V[n]}
for(n=1, 30, print1(a(n), ", "))
CROSSREFS
KEYWORD
sign
AUTHOR
Vaclav Kotesovec, Oct 09 2017
STATUS
approved