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A146597 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 3, 7, 19, 51, 237, 1335, 8829, 68891, 649429, 7839465, 116522409, 2129542541, 47609599737, 1308687213295, 44429361526611, 1853713445956347 (list; graph; refs; listen; history; internal format)
OFFSET

1,5

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.1.0.0.0

.1.0.0.0.1.0.0.0

.1.0.0.0.1.0.0.0

.1.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.1

.0.0.0.1.0.0.0.1

.0.0.0.1.0.0.0.1

.0.0.0.1.1.1.1.0

CROSSREFS

Sequence in context: A087432 A135052 A198305 * A115254 A090378 A007180

Adjacent sequences:  A146594 A146595 A146596 * A146598 A146599 A146600

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 11:46 EST 2012. Contains 206011 sequences.