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!)
A209852 1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences 1

%I

%S 182,2829,43091,661963,10137464,155490654,2383064182,36538359367,

%T 560099384524,8586845703984,131635724835755,2018037972754560,

%U 30936878781499330,474272812069766100,7270720913944659218

%N 1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences

%C Column 2 of A209858

%H R. H. Hardin, <a href="/A209852/b209852.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 11*a(n-1) +139*a(n-2) -972*a(n-3) -4071*a(n-4) +28751*a(n-5) +27819*a(n-6) -332527*a(n-7) +170449*a(n-8) +1380897*a(n-9) -1533070*a(n-10) -2378942*a(n-11) +3871609*a(n-12) +1392648*a(n-13) -4192842*a(n-14) +445370*a(n-15) +1893206*a(n-16) -633950*a(n-17) -236300*a(n-18) +99664*a(n-19) +2096*a(n-20)

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 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 November 29 15:46 EST 2021. Contains 349416 sequences. (Running on oeis4.)