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!)
A218188 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..3 n X n array 0
1, 15, 507, 65251, 33407143, 68410191725, 560375293762217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A218196

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

..1..1..1....0..0..1....0..0..0....1..1..0....0..0..0....1..0..0....0..0..1

..0..0..0....1..1..0....0..0..0....1..1..1....0..0..0....1..0..0....1..0..1

..1..0..1....0..0..1....1..1..0....1..0..0....0..1..0....1..1..0....1..1..1

CROSSREFS

Sequence in context: A203525 A249962 A004703 * A218365 A203326 A092561

Adjacent sequences:  A218185 A218186 A218187 * A218189 A218190 A218191

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 23 2012

STATUS

approved

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 August 10 13:12 EDT 2022. Contains 356039 sequences. (Running on oeis4.)