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A146808 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 19, 27, 613, 1233, 14815, 37647, 702665, 2068725, 127508375, 463231511, 59947853247, 271601475595, 48124416862401, 264540648603861, 70632172948864755 (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

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.0.1.0.0.1.0.0

.1.0.0.0.0.0.0.1

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A053592 A146683 A146651 * A147232 A141417 A264834

Adjacent sequences:  A146805 A146806 A146807 * A146809 A146810 A146811

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 30 14:38 EDT 2022. Contains 357106 sequences. (Running on oeis4.)