OFFSET
1,3
COMMENTS
Column 4 of A180793
LINKS
R. H. Hardin, Table of n, a(n) for n=1..376
EXAMPLE
Solutions for sum of products of 4 1..2 pairs = 1 (mod 3) are
(1*1 + 1*1 + 1*1 + 1*1) (1*1 + 1*1 + 1*1 + 2*2) (1*1 + 1*1 + 2*2 + 2*2)
(1*1 + 1*2 + 1*2 + 1*2) (1*1 + 2*2 + 2*2 + 2*2) (1*2 + 1*2 + 1*2 + 2*2)
(2*2 + 2*2 + 2*2 + 2*2)
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 20 2010
STATUS
approved