A146934 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1111-1111 pattern in any orientation.

1, 1, 1, 5, 3, 15, 9, 102, 95, 2114, 1457, 60876, 28065, 3284271, 1326313, 274823476, 104019594, 40810011642, 14395862201, 12062032991695, 3759057255808, 6192269975577293, 1643495670333065, 5604084539368225288

Offset

1,4

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.0.1.1.1.1.0.0
.0.0.1.1.1.1.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1

Crossrefs

Sequence in context: A070375 A166465 A162813 * A213762 A178067 A213548

Adjacent sequences: A146931 A146932 A146933 * A146935 A146936 A146937

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved