|
|
A265930
|
|
Number of 2Xn 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique.
|
|
1
|
|
|
25, 340, 1740, 9016, 44916, 223788, 1119424, 5621396, 28130560, 140718764, 704493864, 3528165236, 17658676752, 88394841700, 442557740144, 2215472575772, 11090095537400, 55519269652292, 277940545496176, 1391364670745476
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical recurrence of order 55 (see link above)
|
|
EXAMPLE
|
Some solutions for n=4
..0..4..4..3....3..2..4..3....3..1..0..4....4..4..0..1....1..1..3..3
..2..1..3..0....2..0..3..2....1..3..4..0....3..0..1..4....2..0..0..4
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|