The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A223128 Number of 3Xn 0..2 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1

%I

%S 5,72,1154,28907,444555,11814919,186184618,5048458186,80664693231,

%T 2214177564958,35719743830427,988031616090509,16048574199166554,

%U 446266480581619794,7286115298409479410,203387498405308227681

%N Number of 3Xn 0..2 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

%C Row 3 of A223126

%H R. H. Hardin, <a href="/A223128/b223128.txt">Table of n, a(n) for n = 1..19</a>

%e Some solutions for n=3

%e ..0..1..2....0..1..0....0..0..1....0..0..1....0..1..0....0..1..2....0..1..2

%e ..2..0..1....0..1..0....2..0..2....1..2..0....2..1..2....1..0..1....2..0..1

%e ..0..0..0....2..0..2....2..1..1....1..1..2....1..2..0....2..0..1....2..1..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 15 2013

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 4 20:48 EST 2023. Contains 360076 sequences. (Running on oeis4.)