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!)
A219775 Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 4Xn array 1

%I #4 Nov 27 2012 06:15:26

%S 5,8,29,100,291,771,1887,4278,9072,18147,34592,63333,111962,191826,

%T 319428,518191,820642,1271077,1928772,2871809,4201590,6048116,8576112,

%U 11992083,16552390,22572439,30437080,40612317,53658434,70244646,91165388

%N Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 4Xn array

%C Row 4 of A219773

%H R. H. Hardin, <a href="/A219775/b219775.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = (1/10080)*n^8 + (1/1680)*n^7 - (1/48)*n^6 + (41/120)*n^5 - (571/480)*n^4 - (593/240)*n^3 + (19457/252)*n^2 - (43041/70)*n + 1735 for n>9

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 27 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 April 25 16:45 EDT 2024. Contains 371989 sequences. (Running on oeis4.)