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 A235316 Number of (n+1)X(5+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant stress 1X1 tilings) 1

%I

%S 11776,22568,40144,89600,184144,459536,1062832,2873552,7275856,

%T 20859728,56503984,169327760,482451664,1496230736,4431395632,

%U 14119144592,43104667216,140303136848,438787720624,1452514539920,4631009477584

%N Number of (n+1)X(5+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant stress 1X1 tilings)

%C Column 5 of A235319

%H R. H. Hardin, <a href="/A235316/b235316.txt">Table of n, a(n) for n = 1..176</a>

%F 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)

%e Some solutions for n=4

%e ..1..4..2..5..2..3....6..0..5..1..5..1....6..2..6..2..4..2....6..1..5..2..6..1

%e ..5..1..6..2..6..0....4..5..3..6..3..6....2..5..2..5..0..5....1..3..0..4..1..3

%e ..2..5..3..6..3..4....6..0..5..1..5..1....5..1..5..1..3..1....6..1..5..2..6..1

%e ..5..1..6..2..6..0....4..5..3..6..3..6....2..5..2..5..0..5....2..4..1..5..2..4

%e ..2..5..3..6..3..4....6..0..5..1..5..1....6..2..6..2..4..2....5..0..4..1..5..0

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 05 2014

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Last modified January 26 19:45 EST 2021. Contains 340442 sequences. (Running on oeis4.)