A146460 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A146460

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 5, 25, 87, 503, 2831, 25037, 243793, 3762955, 62868913, 1572482009, 42577954723, 1734990453303

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.0.0.0

.1.1.1.0.0.0.0.0

.0.1.0.0.0.0.1.0

.0.0.1.1.0.1.1.1

.1.1.1.0.1.1.0.0

.0.1.0.0.0.0.1.0

.0.0.0.0.0.1.1.1

.0.0.0.0.1.1.0.0

CROSSREFS

Sequence in context: A181477 A147274 A147034 * A223840 A083090 A224148

Adjacent sequences: A146457 A146458 A146459 * A146461 A146462 A146463

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved