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A146818 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1110-0111 pattern in any orientation. 0
1, 1, 1, 1, 3, 9, 23, 59, 317, 2143, 14651, 111875, 1267355, 18704275, 315484781, 6350976523, 167797579971, 5630142919363, 228828878480313 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.0.0.0

.0.0.0.1.1.0.0.1

.1.0.0.1.1.0.1.1

.1.1.1.0.1.0.1.1

.0.1.1.1.0.1.1.0

.0.0.0.0.1.0.0.0

.0.0.1.1.1.0.0.0

.0.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A191342 A077847 A027058 * A309301 A323798 A180488

Adjacent sequences:  A146815 A146816 A146817 * A146819 A146820 A146821

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)