%I A154073
%S A154073 252,2298,1670,5721,2507,7335,2348,4388,1087,1406,468,952,386,767,373,
%T A154073 848,373,812,373,848,373,734,370,848,373,734,373,848,373,734,373,848,370,
%U A154073 734,373,848,373,812,373,848,373,734,370,848,373,734,373,848,373,734,373
%N A154073 Number of planar triangular n X n X n nonnegative integer grids with 
               mirror symmetry about one altitude with every similarly oriented 
               4 X 4 X 4 subtriangle summing to 9.
%e A154073 Maximal zeros solution for n=18
%e A154073 ...................1
%e A154073 ..................0.0
%e A154073 .................0.4.0
%e A154073 ................2.0.0.2
%e A154073 ...............0.0.3.0.0
%e A154073 ..............2.0.1.1.0.2
%e A154073 .............0.2.0.2.0.2.0
%e A154073 ............2.2.0.1.1.0.2.2
%e A154073 ...........0.0.1.0.3.0.1.0.0
%e A154073 ..........0.0.3.1.0.0.1.3.0.0
%e A154073 .........2.2.0.0.0.4.0.0.0.2.2
%e A154073 ........2.0.0.3.1.0.0.1.3.0.0.2
%e A154073 .......0.2.1.0.1.0.3.0.1.0.1.2.0
%e A154073 ......0.0.1.1.2.0.1.1.0.2.1.1.0.0
%e A154073 .....0.2.2.0.0.2.0.2.0.2.0.0.2.2.0
%e A154073 ....4.0.0.1.1.2.0.1.1.0.2.1.1.0.0.4
%e A154073 ...0.0.1.2.1.0.1.0.3.0.1.0.1.2.1.0.0
%e A154073 ..0.2.1.1.0.0.3.1.0.0.1.3.0.0.1.1.2.0
%Y A154073 Sequence in context: A024757 A046379 A154045 this_sequence A166783 A104679 
               A117281
%Y A154073 Adjacent sequences: A154070 A154071 A154072 this_sequence A154074 A154075 
               A154076
%K A154073 nonn
%O A154073 4,1
%A A154073 Ron Hardin (rhhardin(AT)att.net) Jan 04 2009