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A154055 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 3 X 3 X 3 subtriangle summing to 6. 0
30, 67, 78, 94, 85, 83, 54, 55, 32, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

Pattern 35 32 35 29 38 29 starts at n=12 and continues through at least n=60.

LINKS

Table of n, a(n) for n=3..60.

EXAMPLE

Maximal zeros solution for n=12

.............3

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

...........0.3.0

..........3.0.0.3

.........0.0.3.0.0

........0.3.0.0.3.0

.......3.0.0.3.0.0.3

......0.0.3.0.0.3.0.0

.....0.3.0.0.3.0.0.3.0

....3.0.0.3.0.0.3.0.0.3

...0.0.3.0.0.3.0.0.3.0.0

..0.3.0.0.3.0.0.3.0.0.3.0

CROSSREFS

Sequence in context: A219543 A309393 A244341 * A270758 A241192 A064623

Adjacent sequences:  A154052 A154053 A154054 * A154056 A154057 A154058

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified January 19 01:11 EST 2021. Contains 340262 sequences. (Running on oeis4.)