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A146800 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 31, 559, 1013, 8291, 23145, 356907, 1013595, 108749189, 407493401, 61299279691, 281660353619, 43848445982931, 246087198399431, 73605493456575165, 501006153269757647 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.1.0.0.0.0.0.0.1

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A027722 A060342 A045700 * A146731 A146667 A146462

Adjacent sequences:  A146797 A146798 A146799 * A146801 A146802 A146803

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 30 19:02 EST 2021. Contains 349424 sequences. (Running on oeis4.)