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A146416 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 9, 21, 62, 243, 1174, 7129, 48787, 396149, 3872121, 46149825, 666105009, 11588188375, 240646188473, 5995766803300, 179504408659371, 6478981553440867, 281573700280824120, 14724253264482951366 (list; graph; refs; listen; history; internal format)
OFFSET

1,6

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.0.0.1.0.1.0

.0.0.0.0.1.0.1.0

.1.0.0.0.1.0.1.0

.1.1.1.1.0.1.1.1

.1.0.0.0.1.0.0.0

.0.1.1.1.1.0.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A026551 A060578 A147078 * A004667 A073947 A062811

Adjacent sequences:  A146413 A146414 A146415 * A146417 A146418 A146419

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net)

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Last modified February 15 02:50 EST 2012. Contains 205694 sequences.