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!)
A220940 Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor 1

%I

%S 2,208,7551,291080,11115933,424939090,16241930112,620799451653,

%T 23728084357764,906930211627870,34664497553698238,1324939111423377826,

%U 50641541794670836181,1935610258239045700193,73982484134692519016233

%N Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor

%C Column 3 of A220943

%H R. H. Hardin, <a href="/A220940/b220940.txt">Table of n, a(n) for n = 1..21</a>

%e Some solutions for n=3

%e ..0..0..0....0..1..1....2..2..0....0..2..0....2..1..1....2..1..0....0..3..2

%e ..3..2..2....1..1..0....0..4..1....1..0..1....0..0..1....0..1..3....0..1..1

%e ..1..0..1....3..2..0....0..0..0....3..2..0....1..3..0....1..0..1....0..2..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 25 2012

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 18 08:10 EDT 2021. Contains 348066 sequences. (Running on oeis4.)