A154038 - OEIS

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A154038

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 4.

14, 25, 24, 27, 22, 18, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15 (list; graph; refs; listen; history; internal format)

	OFFSET	`3,1`
	COMMENTS	`Pattern 15 16 15 starts at n=9 and continues through at least n=60.`
	EXAMPLE	`Maximal zeros solution for n=9` `..........2` `.........0.0` `........0.2.0` `.......2.0.0.2` `......0.0.2.0.0` `.....0.2.0.0.2.0` `....2.0.0.2.0.0.2` `...0.0.2.0.0.2.0.0` `..0.2.0.0.2.0.0.2.0`
	CROSSREFS	`Sequence in context: A141838 A140499 A068365 * A061923 A031075 A020227` `Adjacent sequences: A154035 A154036 A154037 * A154039 A154040 A154041`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Jan 04 2009`

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Last modified February 14 22:09 EST 2012. Contains 205669 sequences.