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A146912 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation. 0
1, 1, 1, 3, 5, 9, 19, 57, 217, 857, 3619, 18707, 117969, 876253, 7474981, 73822321, 851878121, 11545709859, 183325972139, 3408618427993, 73952504878933, 1873630369319687, 55462085673863451, 1920965075733048401 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.1.0.0

.1.1.1.0.1.1.1.0

.0.1.1.1.0.1.1.1

.0.0.1.0.0.0.1.0

.0.1.0.0.0.1.0.0

.1.1.1.0.1.1.1.0

.0.1.1.1.0.1.1.1

.0.0.1.0.0.0.1.0

CROSSREFS

Sequence in context: A107028 A147470 A147010 * A146940 A146251 A281732

Adjacent sequences:  A146909 A146910 A146911 * A146913 A146914 A146915

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 12 04:22 EDT 2022. Contains 356067 sequences. (Running on oeis4.)