A153951 - OEIS

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

%S 1,2,4,16,48,181,930,8275,75027,1115868,15698357,385413794,9296853593,

%T 385316885091,15604629751554,1064622004776402

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 6 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009