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A234675
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 5 (constant-stress 1 X 1 tilings).
1
404, 1152, 2924, 9108, 25292, 82956, 243164, 823836, 2495084, 8636892, 26700764, 93812028, 294012332, 1044061596, 3303828764, 11823983676, 37682184044, 135642577692, 434618272604, 1571271439548, 5055647094572, 18337480193436
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +47*a(n-2) -200*a(n-3) -901*a(n-4) +4204*a(n-5) +8957*a(n-6) -48440*a(n-7) -47194*a(n-8) +334096*a(n-9) +101948*a(n-10) -1410080*a(n-11) +170136*a(n-12) +3549696*a(n-13) -1446912*a(n-14) -4861440*a(n-15) +2954880*a(n-16) +2764800*a(n-17) -2073600*a(n-18).
EXAMPLE
Some solutions for n=5:
4 2 3 3 2 2 5 0 5 3 2 3 1 3 1 1 0 1 5 2 5
2 5 1 1 5 0 1 1 1 1 5 1 4 1 4 0 4 0 3 5 3
2 0 1 2 1 1 5 0 5 3 2 3 3 5 3 2 1 2 3 0 3
2 5 1 1 5 0 2 2 2 0 4 0 3 0 3 0 4 0 1 3 1
5 3 4 2 1 1 5 0 5 2 1 2 1 3 1 1 0 1 3 0 3
2 5 1 1 5 0 5 5 5 0 4 0 3 0 3 1 5 1 2 4 2
CROSSREFS
Column 2 of A234681.
Sequence in context: A117836 A185640 A185637 * A135791 A187382 A306308
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2013
STATUS
approved