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%I #8 Mar 31 2012 12:35:02
%S 1,27,423,5607,85683,1337727,21331503,344238579,5599424547,
%T 91540779903,1501346684863,24673460611915,406009294231251,
%U 6686397678162879,110171301582051951,1815861973753907787,29935310771775478339
%N Number of base 27 circular n-digit numbers with adjacent digits differing by 9 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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