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Number of length-n 0..n arrays with every repeated value unequal to the previous repeated value plus one mod n+1.
1

%I #5 Mar 04 2016 14:37:38

%S 2,9,64,620,7680,115920,2063880,42342912,983566800,25515160000,

%T 731128554024,22934195241984,781644611944014,28761550510694400,

%U 1136386416816000000,47984229920230342656,2156419762355192954760

%N Number of length-n 0..n arrays with every repeated value unequal to the previous repeated value plus one mod n+1.

%C Diagonal of A269776.

%H R. H. Hardin, <a href="/A269770/b269770.txt">Table of n, a(n) for n = 1..193</a>

%e Some solutions for n=6

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

%e ..2. .0. .2. .2. .2. .5. .1. .1. .1. .5. .4. .0. .4. .5. .2. .2

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

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

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

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

%Y Cf. A269776.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 04 2016