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A153965 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 9 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 4, 15, 31, 126, 927, 3933, 31429, 472959, 4005742, 63878219, 1917687587, 32433255622, 1032580394091, 61890749905798, 2090664356692297, 132950076813594995, 15915454829832076325, 1073793991171675728498 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A268423 A261531 A153968 * A121221 A122598 A279069
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2009
STATUS
approved

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Last modified June 16 23:34 EDT 2024. Contains 373432 sequences. (Running on oeis4.)