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!)
A184144 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically 0
43, 17203, 58656073, 1764076701091, 464796062784203293, 1074317319424680321399811 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A184153

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 3X3 with a(1,1)=0

..0..2..2....0..2..3....0..2..2....0..1..1....0..3..1....0..0..0....0..2..3

..0..0..0....3..3..3....0..2..3....1..1..1....1..3..2....0..2..2....0..2..2

..2..3..3....2..1..2....3..2..0....2..3..2....2..3..3....0..2..0....2..2..0

CROSSREFS

Sequence in context: A208625 A147522 A183489 * A262856 A302484 A177488

Adjacent sequences:  A184141 A184142 A184143 * A184145 A184146 A184147

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 09 2011

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 28 13:03 EDT 2020. Contains 338055 sequences. (Running on oeis4.)