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!)
A236523 T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise 8

%I #4 Jan 27 2014 17:47:28

%S 16,52,52,160,264,160,476,1256,1256,476,1392,5670,9212,5670,1392,4020,

%T 25023,63208,63208,25023,4020,11520,108214,421516,655460,421516,

%U 108214,11520,32828,462970,2728079,6591144,6591144,2728079,462970,32828,93200

%N T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise

%C Table starts

%C .....16.......52........160..........476...........1392.............4020

%C .....52......264.......1256.........5670..........25023...........108214

%C ....160.....1256.......9212........63208.........421516..........2728079

%C ....476.....5670......63208.......655460........6591144.........63997604

%C ...1392....25023.....421516......6591144.......99655626.......1448355717

%C ...4020...108214....2728079.....63997604.....1448355717......31459840764

%C ..11520...462970...17385844....610630403....20627269098.....668463714817

%C ..32828..1962897..109182283...5723134951...287546676233...13878535769685

%C ..93200..8278491..680017778..53126385011..3961701125458..284431385172713

%C .263892.34768983.4204683204.488732268982.53967671743495.5756312538787583

%H R. H. Hardin, <a href="/A236523/b236523.txt">Table of n, a(n) for n = 1..162</a>

%F Empirical for column k:

%F k=1: a(n) = 4*a(n-1) -a(n-2) -8*a(n-3) +4*a(n-4)

%F k=2: [order 15]

%F k=3: [order 37]

%F k=4: [order 82]

%e Some solutions for n=3 k=4

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

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

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

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

%Y Column 1 is A235653

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_, Jan 27 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 April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)