A146725 - OEIS

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A146725

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111 pattern in any orientation.

1, 1, 1, 1, 3, 13, 35, 157, 741, 4435, 44453, 490313, 6256041, 104651895, 2130039209, 56493398929, 1931237117101, 81069750246845, 4246906418006015, 279802247495802441

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0

.1.1.1.0.1.0.1.1

.1.0.1.1.0.0.1.0

.0.0.0.0.0.0.1.1

.0.0.0.1.1.1.0.1

.0.0.0.1.0.1.1.0

CROSSREFS

Sequence in context: A108480 A322187 A146741 * A146424 A146049 A061483

Adjacent sequences: A146722 A146723 A146724 * A146726 A146727 A146728

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved