OFFSET
13,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 13..49
FORMULA
a(n) = 1/7! * [Product_{i=1..7} x_i^n] Product_{j>0} (1+Sum_{i=1..7} x_i^j).
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 25 2015
EXTENSIONS
More terms from Alois P. Heinz, Apr 03 2017
STATUS
approved