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!)
A208839 Number of nX7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 0 vertically 1

%I

%S 42,1764,7086,31419,169974,992574,6206445,40122936,265568130,

%T 1780946115,12045557394,81883111842,558396389421,3815311552572,

%U 26099962612902,178677791790795,1223770846004094,8384018150245206,57448693695345549

%N Number of nX7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 0 vertically

%C Column 7 of A208840

%H R. H. Hardin, <a href="/A208839/b208839.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 11*a(n-1) -17*a(n-2) -124*a(n-3) +276*a(n-4) +396*a(n-5) -902*a(n-6) -462*a(n-7) +946*a(n-8) +220*a(n-9) -340*a(n-10) -44*a(n-11) +39*a(n-12) +3*a(n-13) -a(n-14) for n>15

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 01 2012

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 19 05:04 EDT 2022. Contains 353826 sequences. (Running on oeis4.)