login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A316616 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 4, 13, 26, 189, 1916, 20777, 476965, 16700783, 822198814 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A316620.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

..0..1..1..0..0. .0..0..1..1..1. .0..1..0..1..0. .0..0..1..0..0

..1..0..1..0..0. .0..0..1..0..0. .0..1..1..1..1. .1..1..0..1..1

..0..1..0..0..0. .0..0..0..1..0. .0..0..1..0..1. .0..1..0..1..0

..0..0..1..0..0. .0..0..1..0..1. .0..1..1..0..1. .0..0..1..0..0

..1..1..1..0..0. .0..0..1..1..0. .1..0..0..1..0. .1..1..1..1..1

CROSSREFS

Cf. A316620.

Sequence in context: A304003 A305356 A304946 * A119652 A147875 A321988

Adjacent sequences:  A316613 A316614 A316615 * A316617 A316618 A316619

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 08 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 13 08:08 EST 2019. Contains 329968 sequences. (Running on oeis4.)