A153918 - OEIS

%I #5 Apr 28 2021 00:16:09

%S 1,2,3,6,8,13,27,79,206,623,1643,6478,21771,102958,407720,2191304,

%T 10858499,72602092,437224300,3520328145,25109099300,244666233084,

%U 2097356566526,24692650522065,255493996817129,3611171350858856

%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 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009