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A146455 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 533, 533, 9707, 9707, 296859, 296859, 11801387, 11801387, 824137549, 824137549, 100677999633, 100677999633 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.1.1.1.0.1.1.1.0

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.0.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147211 A147241 A146580 * A146048 A146809 A147233

Adjacent sequences:  A146452 A146453 A146454 * A146456 A146457 A146458

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 2 06:08 EDT 2022. Contains 357191 sequences. (Running on oeis4.)