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 A234920 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 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1

%I

%S 39720,169128,710304,4151672,22970144,150606424,911837036,6251426440,

%T 39266933948,276635826688,1778814863004,12796967663216,83932949350360,

%U 614139960280996,4103610483499364,30438970840376560,207060580976230816

%N 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 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

%H R. H. Hardin, <a href="/A234920/b234920.txt">Table of n, a(n) for n = 1..100</a>

%e Some solutions for n=2:

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

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

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

%Y Column 7 of A234921.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 01 2014

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Last modified March 20 15:35 EDT 2023. Contains 361384 sequences. (Running on oeis4.)