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A154051 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 5. +0
1
144, 321, 322, 328, 186, 123, 89, 49, 37, 31, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27 (list; graph; listen)
OFFSET

5,1

COMMENT

Value 27 starts at n=15 and continues through at least n=60.

EXAMPLE

Maximal zeros solution for n=15

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

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

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

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

............0.0.1.0.0

...........0.0.1.1.0.0

..........2.0.0.0.0.0.2

.........0.0.0.1.1.0.0.0

........0.2.0.0.0.0.0.2.0

.......0.0.0.0.1.1.0.0.0.0

......0.0.1.0.0.1.0.0.1.0.0

.....0.0.1.1.0.0.0.0.1.1.0.0

....2.0.0.0.0.0.2.0.0.0.0.0.2

...0.0.0.1.1.0.0.0.0.1.1.0.0.0

..0.2.0.0.0.0.0.2.0.0.0.0.0.2.0

CROSSREFS

Sequence in context: A008436 A134341 A125841 this_sequence A030633 A034285 A151820

Adjacent sequences: A154048 A154049 A154050 this_sequence A154052 A154053 A154054

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


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