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!)
A235409 Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise 1

%I #4 Jan 10 2014 06:52:00

%S 286,2302,20398,150862,1155953,7379380,48788187,273307984,1578043496,

%T 7881635316,40377942968,182401018359,842470282449,3486469196480,

%U 14723645176175,56437062063876,220480959884552,790014974680676

%N Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise

%C Column 4 of A235413

%H R. H. Hardin, <a href="/A235409/b235409.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 10 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 07:54 EDT 2024. Contains 371922 sequences. (Running on oeis4.)