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!)
A262422 Number of (3+1)X(n+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits. 1

%I

%S 10,12,270,1260,15310,124572,1299070,12380940,124921710,1235566332,

%T 12379963870,123483616620,1235387708110,12346379507292,

%U 123476688644670,1234585890852300,12346166930494510,123457247499499452

%N Number of (3+1)X(n+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits.

%C Row 3 of A262420.

%H R. H. Hardin, <a href="/A262422/b262422.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 10*a(n-1) +46*a(n-2) -460*a(n-3) -609*a(n-4) +6090*a(n-5) +2164*a(n-6) -21640*a(n-7) -1600*a(n-8) +16000*a(n-9)

%e Some solutions for n=4

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

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

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

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

%Y Cf. A262420.

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 22 2015

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 September 22 21:04 EDT 2021. Contains 347608 sequences. (Running on oeis4.)