|
|
A235286
|
|
Number of (n+1) X (5+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings).
|
|
1
|
|
|
236, 304, 380, 544, 740, 1168, 1724, 2944, 4676, 8464, 14300, 26944, 47780, 92368, 169724, 333184, 627716, 1243024, 2382620, 4740544, 9195620, 18341968, 35876924, 71655424, 140988356, 281779984, 556789340, 1113185344, 2206452260, 4412117968
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 3*a(n-1) +3*a(n-2) -15*a(n-3) +4*a(n-4) +18*a(n-5) -12*a(n-6).
|
|
EXAMPLE
|
Some solutions for n=4:
3 1 2 1 3 0 0 2 0 2 1 2 0 3 0 2 0 3 3 1 2 0 2 0
1 3 0 3 1 2 2 0 2 0 3 0 2 1 2 0 2 1 1 3 0 2 0 2
3 1 2 1 3 0 1 3 1 3 2 3 0 3 0 2 0 3 3 1 2 0 2 0
1 3 0 3 1 2 2 0 2 0 3 0 3 2 3 1 3 2 1 3 0 2 0 2
3 1 2 1 3 0 1 3 1 3 2 3 0 3 0 2 0 3 3 1 2 0 2 0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|