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A146841 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 53, 53, 329, 329, 2805, 2805, 46829, 46829, 1364733, 1364733, 44089225, 44089225 (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

.0.0.0.1.0.1.0.0.0

.1.1.1.1.0.1.1.1.1

.1.0.0.1.0.1.0.0.1

.0.0.0.0.0.0.0.0.0

.1.0.0.1.0.1.0.0.1

.1.1.1.1.0.1.1.1.1

.0.0.0.1.0.1.0.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146700 A146708 A146463 * A147180 A146644 A146612

Adjacent sequences:  A146838 A146839 A146840 * A146842 A146843 A146844

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 17 20:06 EST 2022. Contains 350410 sequences. (Running on oeis4.)