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A154044 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 5. 0
20, 40, 40, 43, 35, 33, 18, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

Value 10 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

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

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

...........1.3.1

..........1.0.0.1

.........1.0.2.0.1

........1.1.1.1.1.1

.......0.2.0.1.0.2.0

......1.0.1.1.1.1.0.1

.....2.1.1.0.2.0.1.1.2

....0.0.1.2.0.0.2.1.0.0

...0.2.1.0.0.3.0.0.1.2.0

..2.1.0.1.2.0.0.2.1.0.1.2

CROSSREFS

Sequence in context: A238245 A215144 A040380 * A235289 A296764 A046794

Adjacent sequences:  A154041 A154042 A154043 * A154045 A154046 A154047

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2009

STATUS

approved

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Last modified December 7 20:33 EST 2019. Contains 329849 sequences. (Running on oeis4.)