|
|
A234562
|
|
Number of (n+1) X (6+1) 0..4 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
|
|
|
17518, 24420, 33946, 57210, 94114, 187686, 358450, 810702, 1742578, 4339470, 10208626, 27473790, 69051154, 197748366, 520464850, 1563624222, 4244422258, 13213530990, 36597846706, 116923590270, 328074294994, 1067947652046
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 4*a(n-1) +30*a(n-2) -132*a(n-3) -331*a(n-4) +1720*a(n-5) +1530*a(n-6) -11280*a(n-7) -1324*a(n-8) +39136*a(n-9) -12360*a(n-10) -67968*a(n-11) +39456*a(n-12) +46080*a(n-13) -34560*a(n-14).
|
|
EXAMPLE
|
Some solutions for n=5:
0 3 0 2 1 2 0 4 1 3 1 3 1 4 3 2 4 2 2 2 4
2 1 2 0 3 0 2 1 2 0 2 0 2 1 1 4 2 4 0 4 2
1 4 1 3 2 3 1 3 0 2 0 2 0 3 3 2 4 2 2 2 4
2 1 2 0 3 0 2 3 4 2 4 2 4 3 1 4 2 4 0 4 2
0 3 0 2 1 2 0 3 0 2 0 2 0 3 3 2 4 2 2 2 4
2 1 2 0 3 0 2 2 3 1 3 1 3 2 1 4 2 4 0 4 2
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|