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A146846 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 5, 21, 45, 193, 1001, 5021, 36275, 290647, 2969951, 37399047, 581011371, 11105735741 (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

.1.0.0.1.0.0.0.0

.1.1.1.1.0.0.1.1

.0.0.0.1.0.0.1.0

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.0.1.0.0.1.0.0.0

.1.1.0.0.1.1.1.1

.0.0.0.0.1.0.0.1

CROSSREFS

Sequence in context: A265056 A049741 A166010 * A296200 A041825 A022268

Adjacent sequences:  A146843 A146844 A146845 * A146847 A146848 A146849

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 24 01:05 EST 2020. Contains 331178 sequences. (Running on oeis4.)