A146850 - OEIS

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A146850

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 37, 137, 741, 5145, 37997, 337079, 3889419, 55427643, 967896983, 20644031605, 543669795557, 17692139622867, 706505935324823

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

OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.1.0.0.0

.0.0.0.0.1.1.1.1

.0.0.1.1.0.0.1.1

.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A146280 A282511 A147181 * A146428 A146235 A087728

Adjacent sequences: A146847 A146848 A146849 * A146851 A146852 A146853

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved