A146459 - 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

A146459

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 19, 53, 91, 437, 1171, 6755, 23673, 190687, 829933, 7917835, 43969469, 541189453, 3877768971, 62027074701, 569529515425

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

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.0.0

.0.0.1.0.1.1.0.0

.0.1.1.1.0.1.1.0

.1.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.1

.0.1.1.0.1.1.1.0

.0.0.1.1.0.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A043902 A048696 A046103 * A308025 A360429 A041158

Adjacent sequences: A146456 A146457 A146458 * A146460 A146461 A146462

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved