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A154035 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 3. 0
28, 42, 30, 16, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

Value 1 starts at n=11 and continues through at least n=60.

LINKS

Table of n, a(n) for n=5..60.

EXAMPLE

Maximal zeros solution for n=11

............1

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

..........0.1.0

.........0.0.0.0

........0.0.1.0.0

.......1.0.0.0.0.1

......0.0.0.1.0.0.0

.....0.1.0.0.0.0.1.0

....0.0.0.0.1.0.0.0.0

...0.0.1.0.0.0.0.1.0.0

..1.0.0.0.0.1.0.0.0.0.1

CROSSREFS

Sequence in context: A047630 A135789 A219882 * A025368 A025359 A056031

Adjacent sequences:  A154032 A154033 A154034 * A154036 A154037 A154038

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)