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A146868 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 67, 67, 375, 375, 1415, 1415 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 13 X 13 example

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.1.0.1.1.0.0.0.0.0.1.1.0.1

.0.0.0.0.0.0.0.0.0.0.0.0.0

.1.0.1.1.0.0.0.0.0.1.1.0.1

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A147340 A147499 A146591 * A147430 A147462 A146367

Adjacent sequences:  A146865 A146866 A146867 * A146869 A146870 A146871

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 28 04:54 EDT 2020. Contains 334671 sequences. (Running on oeis4.)