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!)
A222511 Number of 3Xn 0..1 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order 1

%I #4 Feb 23 2013 17:10:35

%S 0,4,4,15,35,170,441,2192,5416,26660,66209,328121,816736,4074688,

%T 10172187,51053330,127212627,643151980,1598614930,8135779154,

%U 20183768037,103256080822,255983883834,1314494576457,3259213240495,16780895442470

%N Number of 3Xn 0..1 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order

%C Row 3 of A222509

%H R. H. Hardin, <a href="/A222511/b222511.txt">Table of n, a(n) for n = 1..77</a>

%e All solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 23 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 June 19 00:22 EDT 2024. Contains 373492 sequences. (Running on oeis4.)