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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A223020 Number of n X 4 0..2 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope. 1
81, 115, 739, 1365, 13997, 35571, 468409, 1445055, 21226859, 73973931, 1148109637, 4289486945, 68628631487, 267714393779, 4363979828661, 17495451002837, 288742958413869, 1179160655695485, 19640515026470277, 81257674712215213 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A223022.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..23

EXAMPLE

Some solutions for n=3:

..2..0..2..1....2..0..2..2....0..1..2..1....1..0..0..1....0..1..1..0

..1..1..0..1....1..2..1..2....1..1..2..2....1..1..1..1....2..0..0..2

..2..0..2..1....2..0..2..2....0..1..2..1....2..1..1..2....0..1..1..0

CROSSREFS

Sequence in context: A120457 A129151 A039546 * A253261 A280587 A273372

Adjacent sequences:  A223017 A223018 A223019 * A223021 A223022 A223023

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 11 2013

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 February 21 06:40 EST 2019. Contains 320371 sequences. (Running on oeis4.)