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!)
A206990 Number of nX4 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically 1

%I

%S 13,169,840,6510,46878,329952,2371090,16939450,120961040,864671390,

%T 6178621414,44150290200,315500062138,2254527357770,16110599565656,

%U 115124947986150,822671737926942,5878731842796456,42008857944366290

%N Number of nX4 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically

%C Column 4 of A206994

%H R. H. Hardin, <a href="/A206990/b206990.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 2*a(n-1) +17*a(n-2) +135*a(n-3) +74*a(n-4) -7*a(n-5) -1496*a(n-6) +492*a(n-7) -890*a(n-8) +4192*a(n-9) -1374*a(n-10) +1082*a(n-11) -3316*a(n-12) +622*a(n-13) +112*a(n-14) +684*a(n-15) -125*a(n-16) -42*a(n-17) -43*a(n-18) +7*a(n-19) +2*a(n-20) +a(n-21) for n>23

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 14 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 September 23 19:41 EDT 2020. Contains 337315 sequences. (Running on oeis4.)