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A146450 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 49, 49, 233, 233, 1205, 1205, 7091, 7091, 56369, 56369, 554977, 554977, 6653663, 6653663 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.0.0.0.0.0.1.0.0

.0.0.1.1.0.0.0.1.1.0.0

.1.1.0.1.1.0.1.1.0.1.1

.0.1.1.0.1.0.1.0.1.1.0

.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

.0.1.1.0.1.0.1.0.1.1.0

.1.1.0.1.1.0.1.1.0.1.1

.0.0.1.1.0.0.0.1.1.0.0

.0.0.1.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A147381 A146035 A147190 * A233810 A263869 A174583

Adjacent sequences:  A146447 A146448 A146449 * A146451 A146452 A146453

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified May 27 03:13 EDT 2022. Contains 354093 sequences. (Running on oeis4.)