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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. 0
55, 118, 138, 97, 37, 21, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15 (list; graph; refs; listen; history; internal format)
OFFSET

4,1

COMMENTS

Value 15 starts at n=10 and continues through at least n=60.

EXAMPLE

Maximal zeros solution for n=10

...........0

..........0.0

.........0.0.1

........0.1.0.0

.......1.0.0.0.0

......0.0.0.0.1.0

.....0.0.0.1.0.0.0

....0.0.1.0.0.0.0.1

...0.1.0.0.0.0.1.0.0

..1.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A044144 A044525 A118151 * A044242 A044623 A063345

Adjacent sequences:  A154028 A154029 A154030 * A154032 A154033 A154034

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified February 15 21:45 EST 2012. Contains 205860 sequences.