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%I #4 Feb 16 2016 11:53:19
%S 7,77,499,2785,15124,84572,497262,3090688,20283861,140149935,
%T 1016257437,7710982245,61062373842,503482366796,4313580692976,
%U 38328590354914,352618807539531,3353663977065151,32927374589832727,333319732348780989
%N Number of length-(n+4) 0..n arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.
%C Subdiagonal 4 of A268956.
%H R. H. Hardin, <a href="/A268958/b268958.txt">Table of n, a(n) for n = 1..118</a>
%e Some solutions for n=6
%e ..0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0
%e ..1. .0. .0. .1. .1. .1. .1. .1. .1. .1. .1. .1. .1. .1. .1. .1
%e ..2. .1. .1. .2. .2. .1. .2. .1. .2. .2. .2. .2. .2. .0. .0. .2
%e ..3. .2. .2. .2. .2. .0. .2. .2. .1. .0. .3. .0. .0. .0. .1. .0
%e ..1. .0. .3. .3. .0. .2. .1. .3. .2. .1. .4. .1. .2. .2. .2. .3
%e ..1. .1. .2. .2. .3. .3. .1. .1. .3. .3. .2. .3. .0. .3. .0. .3
%e ..3. .3. .1. .0. .1. .1. .0. .0. .2. .0. .0. .3. .0. .2. .1. .1
%e ..2. .4. .1. .3. .4. .2. .2. .1. .2. .2. .4. .2. .3. .3. .1. .0
%e ..0. .3. .2. .0. .0. .4. .2. .2. .3. .2. .0. .0. .2. .4. .3. .4
%e ..1. .5. .1. .4. .0. .1. .3. .2. .4. .3. .2. .4. .2. .5. .2. .2
%Y Cf. A268956.
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 16 2016
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