%I A154031
%S A154031 55,118,138,97,37,21,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
%T A154031 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
               15,
%U A154031 15,15,15,15,15,15,15,15,15,15
%N A154031 Number of planar triangular n X n X n nonnegative integer grids with 
               every similarly oriented 4 X 4 X 4 subtriangle summing to 2.
%C A154031 Value 15 starts at n=10 and continues through at least n=60.
%e A154031 Maximal zeros solution for n=10
%e A154031 ...........0
%e A154031 ..........0.0
%e A154031 .........0.0.1
%e A154031 ........0.1.0.0
%e A154031 .......1.0.0.0.0
%e A154031 ......0.0.0.0.1.0
%e A154031 .....0.0.0.1.0.0.0
%e A154031 ....0.0.1.0.0.0.0.1
%e A154031 ...0.1.0.0.0.0.1.0.0
%e A154031 ..1.0.0.0.0.1.0.0.0.0
%Y A154031 Sequence in context: A044144 A044525 A118151 this_sequence A044242 A044623 
               A063345
%Y A154031 Adjacent sequences: A154028 A154029 A154030 this_sequence A154032 A154033 
               A154034
%K A154031 nonn
%O A154031 4,1
%A A154031 Ron Hardin (rhhardin(AT)att.net) Jan 04 2009