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A146404 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 5, 25, 63, 357, 1891, 12499, 113287, 1385821, 19264611, 381162993, 8433132619 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.0.1.0

.0.0.0.1.0.0.1.1

.0.0.0.1.1.0.1.0

.0.0.0.1.0.1.1.0

.0.1.1.0.1.0.0.0

.0.1.0.1.1.0.0.0

.1.1.0.0.1.0.0.0

.0.1.0.0.1.1.0.0

CROSSREFS

Sequence in context: A080856 A060820 A182211 * A323187 A179131 A054994

Adjacent sequences:  A146401 A146402 A146403 * A146405 A146406 A146407

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified February 20 22:51 EST 2019. Contains 320362 sequences. (Running on oeis4.)