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 A234489 Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings) 1

%I

%S 220334,765738,2659824,9288710,32545706,114484712,404043442,

%T 1431125914,5084793448,18127421166,64813774926,232475602952,

%U 836155485018,3016451992646,10910475434292,39574863492918,143905533079266

%N Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings)

%C Column 7 of A234490

%H R. H. Hardin, <a href="/A234489/b234489.txt">Table of n, a(n) for n = 1..34</a>

%e Some solutions for n=1

%e ..0..1..3..2..2..0..2..1....2..3..0..3..3..1..1..3....0..3..0..2..3..1..2..1

%e ..1..0..0..1..3..3..3..0....0..3..2..3..1..1..3..3....0..1..0..0..3..3..2..3

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 26 2013

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Last modified October 20 22:44 EDT 2019. Contains 328291 sequences. (Running on oeis4.)