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!)
A223380 Number of n X n 0..2 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..2 introduced in row major order. 0
1, 9, 777, 329840, 684434305, 6912575555900, 339059747829716414, 80685611230235666219160, 93110832687595932573861629271 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Diagonal of A223387.

Sequence in context: A159356 A246123 A246124 * A246125 A246126 A091057

Adjacent sequences:  A223377 A223378 A223379 * A223381 A223382 A223383

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 19 2013

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 October 21 15:18 EDT 2021. Contains 348155 sequences. (Running on oeis4.)