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A153918 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 3, 6, 8, 13, 27, 79, 206, 623, 1643, 6478, 21771, 102958, 407720, 2191304, 10858499, 72602092, 437224300, 3520328145, 25109099300, 244666233084, 2097356566526, 24692650522065, 255493996817129, 3611171350858856 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

CROSSREFS

Sequence in context: A318027 A004101 A003405 * A308909 A308958 A326450

Adjacent sequences:  A153915 A153916 A153917 * A153919 A153920 A153921

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified February 29 09:35 EST 2020. Contains 332355 sequences. (Running on oeis4.)