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A154042 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 4. 0

%I #3 Mar 31 2012 12:35:21

%S 715,3278,7090,8188,5593,4377,1618,601,228,220,220,220,220,220,220,

%T 220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,

%U 220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220

%N Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 4.

%C Value 220 starts at n=13 and continues through at least n=60.

%e Maximal zeros solution for n=13

%e ..............0

%e .............0.0

%e ............0.0.2

%e ...........0.2.0.0

%e ..........2.0.0.0.0

%e .........0.0.0.0.2.0

%e ........0.0.0.2.0.0.0

%e .......0.0.2.0.0.0.0.2

%e ......0.2.0.0.0.0.2.0.0

%e .....2.0.0.0.0.2.0.0.0.0

%e ....0.0.0.0.2.0.0.0.0.2.0

%e ...0.0.0.2.0.0.0.0.2.0.0.0

%e ..0.0.2.0.0.0.0.2.0.0.0.0.2

%K nonn

%O 4,1

%A _R. H. Hardin_ Jan 04 2009

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)