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A146805 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 15, 43, 67, 129, 405, 1595, 5363, 29827, 122435, 735349, 3608129, 24333239, 151164887, 1326517337 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.1.1.0

.1.1.1.0.0.0.1.1

.1.0.1.0.1.1.1.0

.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0

.0.1.1.1.0.1.0.1

.1.1.0.0.0.1.1.1

.0.1.1.0.0.0.1.0

CROSSREFS

Sequence in context: A093627 A192060 A316642 * A147057 A101165 A127407

Adjacent sequences:  A146802 A146803 A146804 * A146806 A146807 A146808

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified April 25 21:06 EDT 2019. Contains 322461 sequences. (Running on oeis4.)