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A154055 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 6. +0
1
30, 67, 78, 94, 85, 83, 54, 55, 32, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35 (list; graph; listen)
OFFSET

3,1

COMMENT

Pattern 35 32 35 29 38 29 starts at n=12 and continues through at least n=60.

EXAMPLE

Maximal zeros solution for n=12

.............3

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

...........0.3.0

..........3.0.0.3

.........0.0.3.0.0

........0.3.0.0.3.0

.......3.0.0.3.0.0.3

......0.0.3.0.0.3.0.0

.....0.3.0.0.3.0.0.3.0

....3.0.0.3.0.0.3.0.0.3

...0.0.3.0.0.3.0.0.3.0.0

..0.3.0.0.3.0.0.3.0.0.3.0

CROSSREFS

Sequence in context: A044132 A044513 A157346 this_sequence A064623 A112343 A164596

Adjacent sequences: A154052 A154053 A154054 this_sequence A154056 A154057 A154058

KEYWORD

nonn

AUTHOR

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

page 1

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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