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A146777 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0010-1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 205, 205, 3001, 3001, 66003, 66003, 1489297, 1489297, 39955495, 39955495 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.0.1.0.1.0.1.0.1.0

.1.1.1.1.0.1.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.1.0.1.0.1.0

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146793 A146801 A147203 * A147053 A146857 A146668

Adjacent sequences:  A146774 A146775 A146776 * A146778 A146779 A146780

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 27 11:17 EDT 2022. Contains 354896 sequences. (Running on oeis4.)