A235171 - OEIS

A235171

Number of (n+1) X (3+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

%I #6 Jun 19 2022 02:10:16

%S 8688,45776,240020,1264228,6664620,35209872,186233144,986928332,

%T 5236116224,27831579620,148096235716,789461093804,4212865815920,

%U 22520692982832,120511765742428,645968908638908,3465944872151148

%N Number of (n+1) X (3+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

%H R. H. Hardin, <a href="/A235171/b235171.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2:

%e 0 7 5 4 6 5 0 5 3 1 3 5 6 0 5 2 3 6 3 4

%e 2 5 7 2 3 6 5 6 2 4 2 0 5 3 4 5 1 0 1 6

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

%Y Column 3 of A235175.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 04 2014