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!)
A212940 Number of nX5 0..4 arrays with no column j greater than or equal to than column j-1 in all rows 1

%I #7 Jun 27 2012 15:38:35

%S 1,1016501,10058484751,52311221188001,212180664326328751,

%T 764898125476357657001,2592491557886605293297751,

%U 8492622463881130571398876001,27285563319283684654297283766751

%N Number of nX5 0..4 arrays with no column j greater than or equal to than column j-1 in all rows

%C Column 5 of A212943

%H R. H. Hardin, <a href="/A212940/b212940.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 8001*a(n-1) -24144750*a(n-2) +35582371250*a(n-3) -27539217890625*a(n-4) +11055908759765625*a(n-5) -2081011816406250000*a(n-6) +133539505004882812500*a(n-7).

%F Empirical: a(n) = -2*350^n+3*875^n+3*1125^n+3125^n+126^n-4*1875^n-2*525^n. _R. J. Mathar_, Jun 27 2012

%e Some solutions for n=4

%e ..3..0..3..3..1....3..4..4..3..2....0..4..4..3..0....3..2..4..0..0

%e ..4..1..1..3..3....0..1..3..1..4....2..1..1..4..3....0..3..4..0..4

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

%e ..4..0..4..3..4....4..2..0..3..0....3..0..1..2..0....2..1..0..3..0

%K nonn

%O 1,2

%A _R. H. Hardin_ May 31 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 1 17:43 EDT 2024. Contains 372175 sequences. (Running on oeis4.)