|
|
A208302
|
|
Number of 2Xn nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors)
|
|
4
|
|
|
2, 5, 42, 602, 12840, 373780, 14050312, 656404264, 37060650272, 2475181138384, 192262536609952, 17131843186425504, 1731360533569170048, 196551307092757144384, 24860319276726031245440, 3478554309451804194287232
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=4
..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..2..3..4..2....2..1..2..0....2..1..0..3....0..1..0..1....0..1..0..2
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|