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A146458 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 11, 11, 31, 31, 113, 113, 699, 699, 5221, 5221, 45431, 45431, 522967 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.1.0.0.0.1.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

.0.1.0.1.1.0.1.1.0.1.0

.1.1.1.0.1.0.1.0.1.1.1

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

.1.1.1.0.1.0.1.0.1.1.1

.0.1.0.1.1.0.1.1.0.1.0

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.1.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A147159 A146828 A146583 * A122573 A230011 A136123

Adjacent sequences:  A146455 A146456 A146457 * A146459 A146460 A146461

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 18 13:54 EDT 2021. Contains 347527 sequences. (Running on oeis4.)