OFFSET
7,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 7..100
FORMULA
a(n) = 1/4! * [(x*y*z*u)^n] Product_{j>0} (1+x^j+y^j+z^j+u^j).
EXAMPLE
a(9) = 5: [9;8,1;7,2;6,3], [9;8,1;7,2;5,4], [9;8,1;6,3;5,4], [9;7,2;6,3;5,4], [8,1;7,2;6,3;5,4].
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 25 2015
STATUS
approved