A153998 - OEIS

A153998

Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 12 ones in any 5 X 5 X 5 subtriangle.

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

%S 1,2,4,16,64,499,3953,61786,971846,30167054,945677765,58569920903,

%T 3661573089790,452214656078450,56362299453225220,13875014401044838663,

%U 3447151263100307142903,1691594815727250621502922

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 12 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 04 2009