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A146229 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 37, 37, 183, 183, 817, 817, 5601, 5601, 59649, 59649 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

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

EXAMPLE

Maximal 11 X 11 example

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.0.1.0.1.0.0.0.0

.1.1.0.0.1.0.1.0.0.1.1

.1.1.1.1.0.0.0.1.1.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.0.0.1.1.1.1

.1.1.0.0.1.0.1.0.0.1.1

.0.0.0.0.1.0.1.0.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

CROSSREFS

Sequence in context: A146727 A146426 A146051 * A146020 A145948 A049768

Adjacent sequences:  A146226 A146227 A146228 * A146230 A146231 A146232

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 4 15:36 EST 2021. Contains 349526 sequences. (Running on oeis4.)