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!)
A203649 1/25 the number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 0
9, 1517, 1116249, 3906948333, 67213191427593, 5796397762880763341 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A203656
LINKS
EXAMPLE
Some solutions for n=4
..0..1..2..2..4....0..2..2..0..0....1..1..4..3..2....3..3..0..3..4
..2..0..1..2..2....4..0..2..2..0....2..1..1..4..3....2..3..3..4..1
..3..2..0..1..2....3..4..0..2..2....0..2..1..1..4....3..3..0..3..4
..1..3..2..0..1....0..3..4..0..2....0..0..2..1..1....3..2..3..2..3
..0..1..3..2..0....3..0..3..4..0....3..0..0..2..1....4..3..0..3..0
CROSSREFS
Sequence in context: A231191 A217267 A300594 * A187131 A167774 A197206
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 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 March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)