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A234990 Number of (n+1) X (7+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1

%I #6 Jun 19 2022 23:34:30

%S 762002,5628414,58209538,951853990,18608169852,433293595046,

%T 10857686727324,292379412946254,8126291847950614,233115099695210828,

%U 6783985484057006378,200298891324445897770,5954479568379696254384

%N Number of (n+1) X (7+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

%H R. H. Hardin, <a href="/A234990/b234990.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for n=1:

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

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

%Y Column 7 of A234991.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 02 2014

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)