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A146830 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 25, 97, 477, 2077, 8985, 74677, 698825, 7828097, 101646585, 1842811427 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.1.0.0

.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1

.1.0.0.0.1.1.0.0

.0.0.1.1.0.0.0.1

.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0

.0.0.1.0.0.0.1.0

CROSSREFS

Sequence in context: A197085 A273747 A201841 * A316778 A255612 A022729

Adjacent sequences:  A146827 A146828 A146829 * A146831 A146832 A146833

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified March 26 05:43 EDT 2019. Contains 321481 sequences. (Running on oeis4.)