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Search: id:A153989
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A153989 Number of planar n X n X n binary triangular grids with every one adjacent to exactly 2 other ones. +0
1
1, 1, 2, 5, 11, 46, 267, 1767, 17587, 243760, 4437947, 112889388, 3947281130, 187476143214, 12242161648191, 1095392081180001, 134002137948473492, 22462563463091094957, 5156385913433257078626 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A121981 A088148 A088149 this_sequence A160859 A106887 A089609

Adjacent sequences: A153986 A153987 A153988 this_sequence A153990 A153991 A153992

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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