OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..165
FORMULA
a(n) = [x^(4^n)] (Sum_{j=0..3*n+1} x^(4^j))^(3*n+1).
a(n) ~ c * d^n * n^(3*n + 3/2), where d = 0.228881755274644937676549309..., c = 3.08458888791535695636629... - Vaclav Kotesovec, Sep 20 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 09 2017
STATUS
approved