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!)
A250020 Number of length 6+5 0..n arrays with no six consecutive terms having the maximum of any three terms equal to the minimum of the remaining three terms 1

%I

%S 20,5102,246560,4732480,50383892,358850926,1914587120,8226417240,

%T 29886098100,94991593334,270790229072,705292752008,1702428675220,

%U 3850911187910,8235751257376,16772740216208,32720682872916

%N Number of length 6+5 0..n arrays with no six consecutive terms having the maximum of any three terms equal to the minimum of the remaining three terms

%C Row 6 of A250014

%H R. H. Hardin, <a href="/A250020/b250020.txt">Table of n, a(n) for n = 1..40</a>

%F Empirical: a(n) = n^11 - (7/6)*n^10 + (3907/560)*n^9 - (1139/240)*n^8 + (41257/2520)*n^7 - (69/8)*n^6 + (6293/720)*n^5 + (863/80)*n^4 - (5944/315)*n^3 + (55/4)*n^2 - (443/105)*n

%e Some solutions for n=2

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

%e ..2....0....0....0....2....0....2....0....0....2....2....2....0....2....0....2

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

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

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

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

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

%e ..2....2....0....0....2....0....0....0....0....0....2....2....0....2....2....2

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 10 2014

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 April 17 04:36 EDT 2021. Contains 343059 sequences. (Running on oeis4.)