A146806 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 13, 47, 229, 1275, 4761, 35421, 393783, 4470765, 65085801, 1244085727

Offset

1,6

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.0.1.0.0.1.1.1.0
.1.1.1.0.0.0.1.1
.1.0.1.0.0.1.1.0
.1.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.1
.0.1.1.0.0.1.0.1
.1.1.0.0.0.1.1.1
.0.1.1.1.0.0.1.0

Crossrefs

Sequence in context: A141865 A233059 A358287 * A300337 A353965 A355961

Adjacent sequences: A146803 A146804 A146805 * A146807 A146808 A146809

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved