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A146911 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 21, 21, 85, 85, 553, 553, 5197, 5197, 59067, 59067, 895397, 895397, 19192871, 19192871, 570897325, 570897325, 23035046469, 23035046469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.1.0.0

.0.1.1.1.0.1.1.1.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A146607 A147072 A146068 * A146250 A232023 A146695

Adjacent sequences:  A146908 A146909 A146910 * A146912 A146913 A146914

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 31 09:30 EDT 2020. Contains 334748 sequences. (Running on oeis4.)