The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A222913 Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 1

%I #5 Mar 09 2013 08:10:28

%S 0,6,18,136,654,3972,21778,127226,727214,4237154,24617576,144049162,

%T 843945398,4961892900,29226194746,172530718840,1020187713214,

%U 6042341555988,35837121558046,212824919490178,1265353059527832

%N Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order

%C Column 2 of A222918

%H R. H. Hardin, <a href="/A222913/b222913.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 09 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 20 02:39 EDT 2024. Contains 372703 sequences. (Running on oeis4.)