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!)
A250626 Number of (n+1)X(2+1) 0..2 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction 1

%I #4 Nov 26 2014 10:39:23

%S 154,654,2347,7342,20743,53847,130848,300960,662000,1402495,2879592,

%T 5756842,11251304,21566446,40653388,75532791,138589211,251524429,

%U 452156139,806055771,1426424994,2507933115,4384197749,7625189535

%N Number of (n+1)X(2+1) 0..2 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction

%C Column 2 of A250632

%H R. H. Hardin, <a href="/A250626/b250626.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 6*a(n-1) -10*a(n-2) -8*a(n-3) +40*a(n-4) -22*a(n-5) -47*a(n-6) +56*a(n-7) +15*a(n-8) -46*a(n-9) +8*a(n-10) +16*a(n-11) -6*a(n-12) -2*a(n-13) +a(n-14)

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 26 2014

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 March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)