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Search: id:A146842
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A146842 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1111-1000 pattern in any orientation. +0
1
1, 1, 1, 1, 1, 3, 13, 31, 85, 391, 2235, 16087, 124573, 1136363, 12958205, 185857105, 3266797811, 68594033643, 1733074438523, 53263262779599, 1999938243860711 (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

.0.0.0.0.1.0.0.1

.0.0.0.0.1.1.1.1

.0.0.1.1.0.0.0.1

.0.0.0.1.0.0.0.0

.0.0.0.1.0.0.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A146259 A146174 A147134 this_sequence A146191 A058264 A034050

Adjacent sequences: A146839 A146840 A146841 this_sequence A146843 A146844 A146845

KEYWORD

nonn

AUTHOR

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

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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