%I #5 Apr 28 2021 00:14:26
%S 1,2,3,10,29,170,866,8938,80759,1473212,23518209,758000366,
%T 21390884981,1218501715162,60770817102548,6118061305466866,
%U 539278173702963911,95952596838569547200,14947904300936965181323,4700556597989635565249354
%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 2 X 2 X 2 subtriangle.
%K nonn
%O 0,2
%A _R. H. Hardin_, Jan 03 2009