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A234226
Number of (n+1) X (7+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
582144, 1123724, 2264904, 5162984, 12178344, 31418264, 83324136, 236748824, 690049704, 2128516184, 6731960424, 22318060184, 75732130344, 266822847704, 958417428456, 3541285003544, 13272289633704, 50766360814424
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=1:
1 1 2 1 2 4 2 3 1 0 3 4 0 4 0 4 0 2 3 3 2 3 2 0
1 4 2 4 2 1 2 0 1 3 3 1 0 1 0 1 1 0 4 1 3 1 3 4
CROSSREFS
Column 7 of A234227.
Sequence in context: A119402 A187374 A237209 * A190682 A231253 A212468
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 21 2013
STATUS
approved