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Search: id:A146826
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A146826 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation. +0
1
1, 1, 1, 1, 1, 3, 11, 27, 69, 315, 1713, 11493, 84155, 723421, 7696049, 106846827, 1733858135, 33633104443, 799782972413, 23215563898915, 806581387639407 (list; graph; listen)
OFFSET

1,6

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.1

.0.0.0.0.1.1.1.1

.0.0.0.1.0.0.1.0

.0.0.0.1.0.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A147110 A147118 A147157 this_sequence A059400 A077776 A113836

Adjacent sequences: A146823 A146824 A146825 this_sequence A146827 A146828 A146829

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Nov 04 2008

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


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