A146452 - OEIS

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A146452

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 5, 13, 37, 161, 805, 4895, 32839, 307077, 3448973, 48418161, 832120215, 18174765257

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.1.0

.0.1.1.0.1.1.0.1

.1.1.0.1.1.0.1.1

.1.0.1.0.0.1.1.0

.0.1.1.0.0.1.0.1

.1.1.0.1.1.0.1.1

.1.0.1.1.0.1.1.0

.0.1.1.0.0.1.0.0

CROSSREFS

Sequence in context: A199108 A125734 A146925 * A146062 A201612 A129924

Adjacent sequences: A146449 A146450 A146451 * A146453 A146454 A146455

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved