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!)
A209585 Number of n X n 0..n arrays with every element equal to a diagonal or antidiagonal reflection 1
2, 81, 28672, 791015625, 191221621088256, 7860041410116536427241, 2836619246897071128576000000000, 304913968803300753908857213381006097576481 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A209593
LINKS
FORMULA
a(n) = (n+1) ^ (2n-(n modulo 2)) * ((n+1)*(2n+1)) ^ ((n*n-2n+(n modulo 2))/4)
EXAMPLE
Some solutions for n=3
..0..0..1....3..0..2....2..0..1....0..3..0....2..0..0....3..3..3....0..2..2
..0..1..1....1..0..0....0..1..3....2..3..3....2..3..0....2..1..3....2..1..2
..3..1..2....0..1..1....1..3..3....3..2..2....2..2..3....0..2..0....0..2..3
CROSSREFS
Sequence in context: A318587 A302722 A123177 * A090603 A020955 A230398
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 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 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)