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!)
A223405 Number of nX3 0..3 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 0

%I

%S 36,1296,11254,449810,13266784,417523315,14781272688,521262156765,

%T 17822960179390,683066414115964,23438466168324477

%N Number of nX3 0..3 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative

%C Column 3 of A223406

%e Some solutions for n=3

%e ..3..1..0....2..2..2....1..1..2....1..0..2....1..0..1....3..3..3....3..2..2

%e ..1..0..0....1..1..1....2..1..2....1..0..2....0..0..0....1..0..2....2..0..1

%e ..3..2..1....0..1..2....3..1..3....3..0..2....1..2..3....3..1..3....3..2..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 20 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 August 11 10:15 EDT 2022. Contains 356065 sequences. (Running on oeis4.)