|
|
A251004
|
|
Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than the absolute difference of its antidiagonal elements
|
|
1
|
|
|
530, 10743, 218298, 4434257, 90065275, 1829373498, 37157718881, 754736624943, 15329985552866, 311378109150967, 6324619621199857, 128463794143755317, 2609318408138865875, 52999700037507178758, 1076514156083681528652
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 27*a(n-1) -169*a(n-2) +800*a(n-3) -2847*a(n-4) +5874*a(n-5) -6458*a(n-6) +2876*a(n-7) +558*a(n-8) -1473*a(n-9) +1896*a(n-10) -1394*a(n-11) +460*a(n-12) -68*a(n-13)
|
|
EXAMPLE
|
Some solutions for n=2
..2..1..0....0..1..1....2..1..2....0..2..2....2..2..0....1..0..1....1..2..2
..2..0..1....1..0..0....2..2..1....2..2..1....0..1..1....2..2..2....1..0..0
..1..0..2....1..0..1....1..0..0....0..1..2....1..1..2....1..1..2....0..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|