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A235183 Number of (n+1) X (5+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1

%I #8 Jun 19 2022 02:18:47

%S 4656,9780,19952,45128,99096,236376,545768,1351904,3234336,8236464,

%T 20235512,52632200,132063816,349337952,892241120,2393564720,

%U 6209733240,16862423016,44373812264,121811965088,324794526624,900449967888

%N Number of (n+1) X (5+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

%H R. H. Hardin, <a href="/A235183/b235183.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 4*a(n-1) +41*a(n-2) -177*a(n-3) -709*a(n-4) +3405*a(n-5) +6658*a(n-6) -37423*a(n-7) -35857*a(n-8) +259792*a(n-9) +100713*a(n-10) -1189883*a(n-11) -44519*a(n-12) +3652705*a(n-13) -650588*a(n-14) -7506845*a(n-15) +2237158*a(n-16) +10206566*a(n-17) -3478912*a(n-18) -9024208*a(n-19) +2879248*a(n-20) +5075680*a(n-21) -1279200*a(n-22) -1728912*a(n-23) +283680*a(n-24) +319968*a(n-25) -24192*a(n-26) -24192*a(n-27).

%e Some solutions for n=4:

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

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

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

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

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

%Y Column 5 of A235186.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 04 2014

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Last modified April 16 12:05 EDT 2024. Contains 371711 sequences. (Running on oeis4.)