|
|
A185409
|
|
T(n,k)=1/7 the number of nXk 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
|
|
5
|
|
|
0, 1, 1, 1, 13, 1, 7, 150, 150, 7, 13, 1848, 5040, 1848, 13, 55, 22656, 279918, 279918, 22656, 55, 133, 278832, 12205368, 53808534, 12205368, 278832, 133, 463, 3430776, 595974240, 9560464068, 9560464068, 595974240, 3430776, 463, 1261, 42221928
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,5
|
|
COMMENTS
|
Table starts
....0........1...........1.............7............13............55
....1.......13.........150..........1848.........22656........278832
....1......150........5040........279918......12205368.....595974240
....7.....1848......279918......53808534....9560464068.1755419411964
...13....22656....12205368....9560464068.6409594156632
...55...278832...595974240.1755419411964
..133..3430776.27536905674
..463.42221928
.1261
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for 4X3 with a(1,1)=0
..0..3..6....0..0..0....0..0..4....0..0..3....0..3..6....0..3..3....0..0..0
..0..3..6....4..4..4....0..4..4....3..3..3....0..3..6....0..2..2....4..4..4
..2..4..4....1..5..4....0..5..5....3..2..2....5..0..6....1..1..1....5..5..6
..2..2..2....1..5..5....4..4..4....1..1..1....5..0..6....6..6..6....0..0..6
|
|
CROSSREFS
|
|
|
KEYWORD
|
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|