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!)
A203453 Number of n X n 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 0
1, 3, 84, 8837, 5660631, 22078482448, 449985495293440, 48224646798077538850 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203460

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=5

..2..2..2..0..0....2..2..1..1..0....0..2..2..2..2....1..1..0..0..0

..2..0..2..1..0....2..2..1..1..1....0..2..2..2..2....1..2..2..1..0

..2..1..2..1..0....0..1..2..2..1....0..1..0..0..0....2..2..2..1..0

..2..1..2..2..0....2..2..2..2..1....1..1..2..2..0....2..0..0..2..2

..2..2..2..2..0....2..2..0..0..0....1..1..2..2..0....2..2..2..2..2

CROSSREFS

Sequence in context: A160880 A261008 A217524 * A086264 A160878 A152791

Adjacent sequences:  A203450 A203451 A203452 * A203454 A203455 A203456

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2012

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 July 29 12:47 EDT 2021. Contains 346346 sequences. (Running on oeis4.)