A146927 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 7, 10, 30, 37, 151, 202, 698, 975, 4066, 6719, 38176, 61756, 522856, 808712, 8751773, 13746429, 162280787, 268587501, 3757757825, 6472225006, 115990561431, 202655793135

Offset

1,8

Links

Table of n, a(n) for n=1..30.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A251862 A363651 A056807 * A193650 A041783 A041899

Adjacent sequences: A146924 A146925 A146926 * A146928 A146929 A146930

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved