login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A279454 Number of nonequivalent ways to place k>=0 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line. 6
2, 6, 54, 1026, 38931, 2198241, 167110761, 16248457762, 1960813221768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row sum of triangle A279453.

Rotations and reflections of a placement are not counted. For numbers if they are to be counted, see A197458.

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Cf. A197458, A279453.

Sequence in context: A219692 A085078 A152543 * A306021 A122593 A267348

Adjacent sequences:  A279451 A279452 A279453 * A279455 A279456 A279457

KEYWORD

nonn,more

AUTHOR

Heinrich Ludwig, Dec 24 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 04:46 EDT 2019. Contains 323579 sequences. (Running on oeis4.)