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Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with every one adjacent to exactly 2 other ones.
0

%I #3 Mar 31 2012 12:35:21

%S 1,1,2,2,2,4,7,7,19,30,41,111,242,341,1198,2798,5288,19451,58386,

%T 113037,552176,1717743,4407296,22107632,91701868,243757707,1626825070,

%U 6947686128,24465641567,168345671664,954487204861,3466462776895

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with every one adjacent to exactly 2 other ones.

%K nonn

%O 0,3

%A _R. H. Hardin_ Jan 04 2009