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Search: id:A140179
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A140179 Half the number of n X n symmetric binary matrices with adjacent rows differing in at most four positions. +0
1
1, 4, 32, 512, 14513, 603485, 29856303, 1487335683, 68719476736, 2898212537994 (list; graph; listen)
OFFSET

1,2

CROSSREFS

Sequence in context: A102557 A144935 A153511 this_sequence A118990 A036442 A127945

Adjacent sequences: A140176 A140177 A140178 this_sequence A140180 A140181 A140182

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Jun 15 2008

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.


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