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%I #8 Mar 31 2012 12:35:02
%S 1,17,157,1217,10897,99567,930325,8804659,84089185,808066595,
%T 7798163337,75472491155,731870201089,7106464302539,69065385986985,
%U 671627073012627,6533884441843137,63581778953757883,618832556808380185
%N Number of base 17 circular n-digit numbers with adjacent digits differing by 5 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(5) for base>=5.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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