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!)
A221439 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 n X n array 1

%I

%S 1,9,221,18393,6415089,8569227073,43045366565233,827667742380908273,

%T 60943705772313538144913,17137605013408451421126281145,

%U 18409652574456111249919293718583541

%N Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 n X n array

%C Diagonal of A221446

%H R. H. Hardin, <a href="/A221439/b221439.txt">Table of n, a(n) for n = 1..14</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 17 2013

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 18 05:45 EDT 2022. Contains 353783 sequences. (Running on oeis4.)