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!)
A252878 Number of (n+2)X(2+2) 0..2 arrays with every consecutive three elements in every row having 2 or 3 distinct values, in every column 1 or 2 distinct values, in every diagonal 2 distinct values, and in every antidiagonal 2 distinct values, and new values 0 upwards introduced in row major order 1
3847, 25227, 175360, 1284278, 9590968, 71744739, 538250710, 4042792083, 30378440984, 228336299434, 1716547733894, 12905265671485, 97027793141860, 729515470475319, 5485019076491089, 41240570566543200, 310079418285221777 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A252882
LINKS
EXAMPLE
Some solutions for n=3
..0..0..1..2....0..0..1..1....0..0..1..2....0..1..2..2....0..0..1..1
..0..1..1..0....1..0..2..1....2..1..0..2....2..0..1..2....0..1..0..0
..2..1..1..0....0..2..1..0....0..0..1..2....2..1..2..2....2..1..0..1
..2..1..1..2....1..0..2..1....2..1..0..2....2..0..1..2....0..2..1..1
..0..0..1..0....1..0..1..0....0..0..1..1....2..1..2..0....2..2..1..2
CROSSREFS
Sequence in context: A185773 A031560 A180505 * A234918 A015069 A015070
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 24 2014
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 March 28 16:12 EDT 2024. Contains 371254 sequences. (Running on oeis4.)