A153970 - OEIS

A153970

Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 5 X 5 X 5 subtriangle.

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

%S 1,2,2,4,7,12,22,77,142,532,1881,6680,23965,163600,576849,3866824,

%T 26635009,176366633,1204710337,15393505413,104674234457,1334666498849,

%U 17456897665295,221752333314343,2885843552520634,70795502834846238

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009