OFFSET
0,2
COMMENTS
It can be seen as interesting that a(t) = A178185(t+1) for 0 <= t <= 3.
EXAMPLE
a(1) = 9 because {(1,4), (2,5), (3,6)}, {(1,5), (2,6), (3,4)}, {(1,6), (2,4), (3,5)}, {(1,3), (2,6), (4,5)}, {(1,5), (2,3), (4,6)}, {(1,6), (2,3), (4,5)}, {(1,3), (2,4), (5,6)}, {(1,2), (3,5), (4,6)}, {(1,2), (3,4), (5,6)} are corresponding sets.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Altug Alkan, Oct 11 2018
STATUS
approved