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!)
A303308 Number of n X n 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
1, 3, 12, 36, 139, 1221, 26184, 746323, 23967605, 1285074158, 140135122490, 23444843868325, 5152091496332058, 1785689257359207106, 1097023324108868377427, 1066418515771155179484946 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303314.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303314.

Sequence in context: A167993 A061130 A247008 * A155714 A282022 A004661

Adjacent sequences:  A303305 A303306 A303307 * A303309 A303310 A303311

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 21 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 March 5 11:57 EST 2021. Contains 341823 sequences. (Running on oeis4.)