A153525 - OEIS

%I #5 Apr 28 2021 00:02:26

%S 1,2,8,57,775,19641,921690,80625050,13124722225,3973078785189,

%T 2237747461311054,2344793549245488048,4570701601942028573011,

%U 16575255948705837833863791,111824026459437969673639006613

%N Number of planar n X n X n binary triangular grids with no more than 4 ones in any 3 X 3 X 3 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 01 2009