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Search: id:A140196
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A140196 Number of symmetric binary n X n matrices with every 1 adjacent horizontally (and vertically) to some 0. +0
1
1, 5, 21, 175, 2665, 69147, 3183841, 259010439, 36989095651, 9310549716061, 4127913626714981, 3221885485823007739, 4428893445413111685241, 10721218357954583752212691, 45702135675375111739043639093 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A050910 A117067 A123334 this_sequence A027160 A119686 A141798

Adjacent sequences: A140193 A140194 A140195 this_sequence A140197 A140198 A140199

KEYWORD

nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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