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.

1, 1, 1, 1, 1, 1, 17, 31, 559, 1013, 8291, 23145, 356907, 1013595, 108749189, 407493401, 61299279691, 281660353619, 43848445982931, 246087198399431, 73605493456575165, 501006153269757647

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