A153989 - OEIS

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A153989

Number of planar n X n X n binary triangular grids with every one adjacent to exactly 2 other ones.

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

%S 1,1,2,5,11,46,267,1767,17587,243760,4437947,112889388,3947281130,

%T 187476143214,12242161648191,1095392081180001,134002137948473492,

%U 22462563463091094957,5156385913433257078626

%N Number of planar n X n X n binary triangular grids with every one adjacent to exactly 2 other ones.

%K nonn

%O 0,3

%A _R. H. Hardin_ Jan 04 2009