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%I #5 Mar 03 2016 13:31:13
%S 2,9,64,615,7584,114205,2031072,41651631,967466240,25102071621,
%T 719516990160,22578674361815,769853562649248,28340118309069645,
%U 1120229004620264896,47322526714956795615,2127582051231624604416
%N Number of length-n 0..n arrays with no repeated value differing from the previous repeated value by plus or minus one modulo n+1.
%C Diagonal of A269690.
%H R. H. Hardin, <a href="/A269683/b269683.txt">Table of n, a(n) for n = 1..193</a>
%e Some solutions for n=6
%e ..1. .1. .6. .1. .5. .0. .0. .5. .4. .2. .2. .4. .2. .0. .6. .4
%e ..5. .5. .3. .0. .1. .2. .2. .2. .5. .2. .3. .3. .0. .2. .1. .6
%e ..3. .3. .4. .4. .0. .3. .0. .2. .5. .5. .5. .4. .6. .4. .6. .4
%e ..6. .4. .4. .3. .5. .4. .6. .2. .0. .6. .3. .3. .3. .4. .3. .0
%e ..5. .2. .1. .1. .0. .5. .4. .3. .3. .3. .1. .4. .0. .0. .6. .1
%e ..2. .3. .0. .3. .5. .5. .6. .2. .5. .6. .0. .4. .4. .5. .5. .0
%Y Cf. A269690.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 03 2016