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!)
A209889 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having two distinct values, and new values 0..2 introduced in row major order 0
7, 280, 32800, 11857440, 13410113952, 48053885453696, 549425473875967488, 20157265447359860793760, 2382356941753966065667915808, 909958586859400389363702903272960 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A209897

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A065581 A062646 A009503 * A176072 A096548 A160072

Adjacent sequences:  A209886 A209887 A209888 * A209890 A209891 A209892

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 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 February 18 21:20 EST 2020. Contains 332028 sequences. (Running on oeis4.)