A146902 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 21, 33, 169, 271, 1427, 2719, 19923, 41145, 1164335, 2872687, 96665317, 273847235, 9740767609, 31500367345, 1586820300667, 5818312961823, 565090352547181, 2386581867483507, 366376672212858833, 1779376151775593621

Offset

1,9

Links

Table of n, a(n) for n=1..28.

Example

Maximal 9 X 9 example
.0.1.0.0.0.0.0.1.0
.0.1.1.1.0.1.1.1.0
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.0.1.0
.0.1.1.1.0.1.1.1.0
.1.1.1.0.0.0.1.1.1
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A270074 A350099 A032792 * A146910 A328862 A167397

Adjacent sequences: A146899 A146900 A146901 * A146903 A146904 A146905

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved