OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..139
PROG
(Python)
def a(n):
zn = list(range(n+1))
prod3 = list(set(i*j*k for i in zn for j in zn[i:] for k in zn[j:]))
return len(set(a+b for i, a in enumerate(prod3) for b in prod3[i:]))
print([a(n) for n in range(1, 42)]) # Michael S. Branicky, Mar 12 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2013
STATUS
approved