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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.
0

%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