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A067968 Number of binary arrangements on n X n array without adjacent three 1's. 3
2, 11, 163, 6547, 720417, 216173426, 177509416175, 398239490006383, 2441922679051541299, 40923800121824894177005, 1874434223405139511637099884, 234647514833189124245764389957097 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

REFERENCES

S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 342-349.

LINKS

S. R. Finch, Hard Square Entropy Constant

CROSSREFS

Adjacent three in a row or column gives A050974.

Sequence in context: A188684 A143875 A058154 * A197336 A013050 A051255

Adjacent sequences:  A067965 A067966 A067967 * A067969 A067970 A067971

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net), Feb 02 2002

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.