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A146230 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 13, 33, 61, 183, 597, 2481, 11129, 55369, 260691, 1725489, 11211005, 97261999, 792491905, 8327148961, 84267555083, 1143224998469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.0.0.1.1.0.0

.1.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.1

.0.0.1.1.0.0.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A168375 A032586 A147137 * A166805 A252979 A332366

Adjacent sequences:  A146227 A146228 A146229 * A146231 A146232 A146233

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified June 26 06:32 EDT 2022. Contains 354877 sequences. (Running on oeis4.)