A153912 - OEIS

%I #5 Apr 28 2021 00:15:31

%S 1,2,28586,195384,2093119,20428045,317866834,4492197059,100898111116,

%T 2073132268053,67489432729042,2005814360075163,94662265499676795,

%U 4075394325398277635,278524123602639198495,17377022786797473216927

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 3 X 3 X 3 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009