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A154061 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 6. 0
300, 782, 945, 1120, 906, 954, 767, 352, 274, 247, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

Pattern 240 284 240 240 240 starts at n=15 and continues through at least n=59.

LINKS

Table of n, a(n) for n=5..57.

EXAMPLE

Maximal zeros solution for n=15

................2

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

..............0.2.0

.............0.0.0.0

............0.0.2.0.0

...........2.0.0.0.0.2

..........0.0.0.2.0.0.0

.........0.2.0.0.0.0.2.0

........0.0.0.0.2.0.0.0.0

.......0.0.2.0.0.0.0.2.0.0

......2.0.0.0.0.2.0.0.0.0.2

.....0.0.0.2.0.0.0.0.2.0.0.0

....0.2.0.0.0.0.2.0.0.0.0.2.0

...0.0.0.0.2.0.0.0.0.2.0.0.0.0

..0.0.2.0.0.0.0.2.0.0.0.0.2.0.0

CROSSREFS

Sequence in context: A102509 A250008 A190879 * A253650 A054026 A237773

Adjacent sequences:  A154058 A154059 A154060 * A154062 A154063 A154064

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified September 19 12:57 EDT 2019. Contains 327198 sequences. (Running on oeis4.)