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Search: id:A153902
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A153902 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 1 one in any 4 X 4 X 4 subtriangle. +0
1
1, 2, 1, 1, 2, 2, 4, 8, 9, 13, 28, 40, 68, 188, 247, 498, 1534, 2240, 5457, 19030, 34984, 92787, 351730, 736460, 2179274, 9660082, 22277066, 75466794, 381461162, 984019235, 3823360536 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A036863 A083698 A128976 this_sequence A046772 A114551 A166967

Adjacent sequences: A153899 A153900 A153901 this_sequence A153903 A153904 A153905

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 03 2009

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

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