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A146585 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 5, 21, 83, 423, 2315, 16901, 170185, 2128101, 35334761, 707503833, 18370140687, 587431855321 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.0

.0.0.1.0.1.1.1.0

.0.1.1.1.0.1.0.0

.0.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A132310 A083319 A146041 * A215008 A026027 A002054

Adjacent sequences:  A146582 A146583 A146584 * A146586 A146587 A146588

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 20 05:51 EDT 2020. Contains 337897 sequences. (Running on oeis4.)