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A146572 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 369, 369, 6075, 6075, 152201, 152201, 4520107, 4520107, 199476793, 199476793, 15394540581 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.0.1.0.1.0.0.0

.0.1.1.1.0.1.1.1.0

.0.0.0.1.0.1.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.1.0.1.0.0.0

.0.1.1.1.0.1.1.1.0

.0.0.0.1.0.1.0.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A146692 A146439 A146785 * A147211 A147241 A146580

Adjacent sequences:  A146569 A146570 A146571 * A146573 A146574 A146575

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 28 18:53 EDT 2022. Contains 357081 sequences. (Running on oeis4.)