A146858 - 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

A146858

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 43, 153, 711, 4787, 36997, 323223, 3456487, 47029493, 778875019, 15666901145, 390119856899, 11978383979491, 447614381910255, 20341843546977767

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

OFFSET

1,6

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.1.1.0.0

.0.0.1.1.1.0.0.0

.1.1.0.0.1.0.0.1

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.1.0.0.1.0.0.1.1

.0.0.0.1.1.1.0.0

.0.0.1.1.0.1.0.0

CROSSREFS

Sequence in context: A046916 A089527 A146778 * A146183 A163424 A294102

Adjacent sequences: A146855 A146856 A146857 * A146859 A146860 A146861

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved