A146468 - 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

A146468

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 21, 61, 413, 1837, 12959, 107653, 1592585, 19952617, 467249637, 9827027521, 347403836941

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

OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.0.0.1.1.1.0

.0.1.0.0.1.0.0.1

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.1.0.0.1.0.0.1.0

.0.1.1.1.0.0.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A069133 A124714 A126375 * A081302 A058100 A219856

Adjacent sequences: A146465 A146466 A146467 * A146469 A146470 A146471

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved