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A154067 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 4 X 4 X 4 subtriangle summing to 8. 0
182, 1408, 988, 2849, 1206, 2855, 879, 1266, 284, 262, 114, 119, 51, 61, 51, 61, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

Value 51 starts at n=20 and continues through at least n=60.

LINKS

Table of n, a(n) for n=4..60.

EXAMPLE

Maximal zeros solution for n=20

.....................4

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

...................0.4.0

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

.................0.0.4.0.0

................4.0.0.0.0.4

...............0.0.0.4.0.0.0

..............0.4.0.0.0.0.4.0

.............0.0.0.0.4.0.0.0.0

............0.0.4.0.0.0.0.4.0.0

...........4.0.0.0.0.4.0.0.0.0.4

..........0.0.0.4.0.0.0.0.4.0.0.0

.........0.4.0.0.0.0.4.0.0.0.0.4.0

........0.0.0.0.4.0.0.0.0.4.0.0.0.0

.......0.0.4.0.0.0.0.4.0.0.0.0.4.0.0

......4.0.0.0.0.4.0.0.0.0.4.0.0.0.0.4

.....0.0.0.4.0.0.0.0.4.0.0.0.0.4.0.0.0

....0.4.0.0.0.0.4.0.0.0.0.4.0.0.0.0.4.0

...0.0.0.0.4.0.0.0.0.4.0.0.0.0.4.0.0.0.0

..0.0.4.0.0.0.0.4.0.0.0.0.4.0.0.0.0.4.0.0

CROSSREFS

Sequence in context: A043463 A047636 A157205 * A234982 A234975 A186125

Adjacent sequences:  A154064 A154065 A154066 * A154068 A154069 A154070

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified October 23 04:06 EDT 2021. Contains 348211 sequences. (Running on oeis4.)