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A234233
T(n,k) is the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant-stress 1 X 1 tilings).
6
568, 5260, 5260, 48592, 57912, 48592, 449880, 635904, 635904, 449880, 4160672, 7024396, 8260920, 7024396, 4160672, 38547120, 77499592, 108591688, 108591688, 77499592, 38547120, 356781376, 859364784, 1418241440, 1709929028, 1418241440
OFFSET
1,1
COMMENTS
Table starts
568 5260 48592 449880 4160672
5260 57912 635904 7024396 77499592
48592 635904 8260920 108591688 1418241440
449880 7024396 108591688 1709929028 26695387444
4160672 77499592 1418241440 26695387444 493912218368
38547120 859364784 18729039912 424316463256 9404301310916
356781376 9519608332 245685138024 6683714234372
3308068320 106004400596 3261204356760
30642026624 1179099470276
284343188160
LINKS
FORMULA
Empirical for column k:
k=1: a(n) = 182*a(n-2) -9024*a(n-4) +66960*a(n-6).
k=2: [order 40].
EXAMPLE
Some solutions for n=2, k=4:
0 0 6 6 6 4 4 2 3 7 0 0 4 4 2 0 2 0 6 1
6 3 6 3 0 2 5 0 4 5 4 1 2 5 6 2 1 2 5 3
6 0 6 6 6 4 4 2 3 7 6 0 4 4 2 0 2 0 6 1
CROSSREFS
Sequence in context: A087424 A134922 A322688 * A234228 A184682 A223164
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 21 2013
STATUS
approved