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A146806 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 13, 47, 229, 1275, 4761, 35421, 393783, 4470765, 65085801, 1244085727 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.1.1.0

.1.1.1.0.0.0.1.1

.1.0.1.0.0.1.1.0

.1.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.1

.0.1.1.0.0.1.0.1

.1.1.0.0.0.1.1.1

.0.1.1.1.0.0.1.0

CROSSREFS

Sequence in context: A141865 A233059 A183775 * A300337 A135712 A225920

Adjacent sequences:  A146803 A146804 A146805 * A146807 A146808 A146809

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)