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Search: id:A140363
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A140363 Number of n X n symmetric binary matrices with every 1 adjacent horizontally (and vertically) to some other 1. +0
1
1, 2, 8, 40, 310, 4155, 89670, 3070348, 168002166, 14759284768, 2075629841521, 467015770766284, 168271584258210602, 97113565640564063834, 89738360022163805917690 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Adjacent sequences: A140360 A140361 A140362 this_sequence A140364 A140365 A140366

Sequence in context: A002301 A000828 A111394 this_sequence A012597 A012534 A092354

KEYWORD

nonn

AUTHOR

Ron Hardin (rhh(AT)cadence.com), Jun 15 2008

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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