A153933 - OEIS

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A153933

Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 ones in any 4 X 4 X 4 subtriangle.

1, 2, 4, 13, 26, 135, 581, 5081, 33999, 455470, 5028919, 110445068, 1936072745, 69174531647, 1977766145879, 114385090415133, 5299105178883837, 494911099658091565, 37117101455488584937 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	LINKS	`Table of n, a(n) for n=0..18.`
	CROSSREFS	`Sequence in context: A189583 A153936 A027301 * A128601 A034500 A261455` `Adjacent sequences: A153930 A153931 A153932 * A153934 A153935 A153936`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, Jan 03 2009`
	STATUS	`approved`

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Last modified March 28 01:22 EDT 2023. Contains 361575 sequences. (Running on oeis4.)