A146008 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.

1, 1, 1, 1, 1, 1, 10, 5, 94, 17, 755, 53, 7939, 559, 210819, 10558, 8799077, 208889, 469946628, 6272332, 39105876330, 353563401, 5486841066288, 30617473617, 1188207651549069, 3806002157431, 391224146110279498, 753576262868027

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0

Crossrefs

Sequence in context: A033962 A241360 A096898 * A038307 A094260 A239603

Adjacent sequences: A146005 A146006 A146007 * A146009 A146010 A146011

Keyword

nonn

Author

R. H. Hardin, Oct 26 2008

Status

approved