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A234224
Number of (n+1) X (5+1) 0..4 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
32384, 76972, 188040, 503272, 1379816, 4055128, 12178344, 38671960, 125308904, 425135512, 1469047080, 5270085592, 19196627816, 72039007768, 273444136104, 1062448914520, 4159847890664, 16591856007832, 66478192455720
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) +16*a(n-2) -460*a(n-3) +789*a(n-4) +7170*a(n-5) -23944*a(n-6) -39920*a(n-7) +246076*a(n-8) -38440*a(n-9) -1115136*a(n-10) +1151040*a(n-11) +2005056*a(n-12) -3657600*a(n-13) -331776*a(n-14) +3456000*a(n-15) -1658880*a(n-16).
EXAMPLE
Some solutions for n=3:
0 3 0 0 4 1 2 2 2 1 2 1 0 2 1 1 0 0 0 1 1 0 3 4
0 0 0 3 4 4 1 4 1 3 1 3 3 2 4 1 3 0 3 1 4 0 0 4
0 3 0 0 4 1 1 1 1 0 1 0 2 4 3 3 2 2 3 4 4 3 0 1
0 0 0 3 4 4 0 3 0 2 0 2 3 2 4 1 3 0 0 4 1 3 3 1
CROSSREFS
Column 5 of A234227.
Sequence in context: A251875 A156038 A156048 * A190471 A236994 A156421
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 21 2013
STATUS
approved