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A154039 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 3 X 3 X 3 subtriangle summing to 4. 0
126, 503, 1046, 1389, 1898, 1290, 897, 912, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900, 621, 621, 900 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

Pattern 621 621 900 starts at n=11 and continues through at least n=57.

LINKS

Table of n, a(n) for n=3..55.

EXAMPLE

Maximal zeros solution for n=11

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

...........0.0

..........0.2.2

.........2.0.0.0

........0.0.2.0.0

.......0.2.0.0.2.2

......2.0.0.2.0.0.0

.....0.0.2.0.0.2.0.0

....0.2.0.0.2.0.0.2.2

...2.0.0.2.0.0.2.0.0.0

..0.0.2.0.0.2.0.0.2.0.0

CROSSREFS

Sequence in context: A222341 A241270 A135192 * A202601 A202594 A245992

Adjacent sequences:  A154036 A154037 A154038 * A154040 A154041 A154042

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified January 17 20:06 EST 2022. Contains 350410 sequences. (Running on oeis4.)