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!)
A201273 Number of nX4 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other 1

%I #5 Mar 31 2012 12:36:44

%S 3,12,14,85,199,143,740,1274,759,3416,5312,2746,11628,16676,7946,

%T 32164,43438,19713,76321,99347,43137,162566,205231,86351,318364,

%U 391600,161089,581578,702330,282904,1006014,1195239,473473,1662549,1947164,761467

%N Number of nX4 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other

%C Column 4 of A201277

%H R. H. Hardin, <a href="/A201273/b201273.txt">Table of n, a(n) for n = 1..192</a>

%F Empirical: a(n) = a(n-3) +2*a(n-6) +a(n-9) -4*a(n-12) -5*a(n-15) +4*a(n-18) +5*a(n-21) +a(n-24) -6*a(n-27) +6*a(n-33) -a(n-36) -5*a(n-39) -4*a(n-42) +5*a(n-45) +4*a(n-48) -a(n-51) -2*a(n-54) -a(n-57) +a(n-60)

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 29 2011

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 October 1 02:24 EDT 2023. Contains 365812 sequences. (Running on oeis4.)