A146395 - 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

A146395

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 19, 43, 103, 349, 1189, 4335, 18031, 97075, 543815, 3556863, 24384071, 196142765, 1671349393

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

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.0.0.1.1.0.0

.0.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.1

.1.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.0

.0.0.1.1.0.0.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A020580 A172043 A146616 * A154302 A146736 A176358

Adjacent sequences: A146392 A146393 A146394 * A146396 A146397 A146398

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved