OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..128
FORMULA
a(n) = [x^(5^n)] (Sum_{j=0..4*n+1} x^(5^j))^(4*n+1).
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 09 2017
STATUS
approved