login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A303405 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
0, 3, 28, 168, 4013, 236326, 24386918, 4298730424, 1222253462556 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303410.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303410.

Sequence in context: A012762 A012778 A302522 * A074922 A285365 A160872

Adjacent sequences:  A303402 A303403 A303404 * A303406 A303407 A303408

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 23 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 September 16 21:28 EDT 2021. Contains 347473 sequences. (Running on oeis4.)