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A234544
Number of (n+1) X (2+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant-stress 1 X 1 tilings).
1
1212, 6896, 39188, 222988, 1269812, 7237508, 41285540, 235717236, 1346930052, 7703391252, 44093945060, 252614282612, 1448426221700, 8312186475348, 47741148641380, 274441042958900, 1578929657150788, 9091864955315348
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 17*a(n-1) -30*a(n-2) -944*a(n-3) +5146*a(n-4) +8720*a(n-5) -112704*a(n-6) +148224*a(n-7) +392632*a(n-8) -632528*a(n-9) -548544*a(n-10) +867968*a(n-11) +341120*a(n-12) -478976*a(n-13) -76800*a(n-14) +92160*a(n-15).
EXAMPLE
Some solutions for n=3:
4 4 1 3 0 0 1 3 3 1 4 2 5 4 5 2 0 3 3 0 3
5 2 2 0 0 3 2 1 4 2 2 3 3 5 3 5 0 0 1 1 1
1 1 4 5 2 2 1 3 3 4 1 5 4 3 4 5 3 0 1 4 1
1 4 4 3 3 0 4 3 0 1 1 2 1 3 1 3 4 4 2 2 2
CROSSREFS
Column 2 of A234549.
Sequence in context: A047627 A252213 A258727 * A047626 A204339 A204332
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2013
STATUS
approved