A153927 - OEIS

A153927

Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 3 ones in any 5 X 5 X 5 subtriangle.

%I #5 Apr 28 2021 00:17:10

%S 1,2,4,10,16,32,84,364,1408,7139,31239,217079,1318253,12282116,

%T 97242555,1151164326,12499753964,202416004411,2931538091352,

%U 63055463078232,1202866099324497,34468364489176178

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 3 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009