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!)
A301901 Number of nXn 0..1 arrays with every element equal to 0, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero. 0
1, 1, 3, 5, 12, 532, 8781, 952467, 81388360, 24626668920, 14235727386501, 14622615341736656, 38187293105036003115, 169994743921070851334774, 1720618701132822565695718755 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A301906.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301906.

Sequence in context: A156436 A276735 A099791 * A263829 A028268 A171424

Adjacent sequences:  A301898 A301899 A301900 * A301902 A301903 A301904

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 28 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 7 18:12 EST 2019. Contains 329847 sequences. (Running on oeis4.)