OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..138
PROG
(Python)
from itertools import combinations_with_replacement as mc
def a(n):
prods = set(a*b*c for a, b, c in mc(range(n+1), 3))
return len(set(sum(p) for p in mc(prods, 4)))
print([a(n) for n in range(1, 11)]) # Michael S. Branicky, May 28 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2013
STATUS
approved