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A050974 Number of binary arrangements on n X n array without three adjacent 1's in a row or column. 2
2, 16, 265, 16561, 3157010, 1828904402, 3323590649777, 18691199385898465, 325778072452564800064, 17617718915229579206450786, 2954164381835835259001326344913, 1536134628973698280539373190731911729 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

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

LINKS

Table of n, a(n) for n=1..12.

S. R. Finch, Hard Square Entropy Constant

Eric Weisstein's World of Mathematics, 01-Matrix.

CROSSREFS

Any connected three 1's gives A067968.

Cf. A006506.

Sequence in context: A246739 A283685 A197458 * A012188 A217816 A000182

Adjacent sequences:  A050971 A050972 A050973 * A050975 A050976 A050977

KEYWORD

nonn

AUTHOR

Eric W. Weisstein

EXTENSIONS

More terms from R. H. Hardin, Feb 02 2002

STATUS

approved

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Last modified October 21 00:56 EDT 2017. Contains 293679 sequences.