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%I #8 Mar 31 2012 12:35:02
%S 1,26,370,4418,60994,859946,12394450,180932330,2664959170,39489358346,
%T 587550685330,8766115538074,131030613689314,1960994655183018,
%U 29372400375221042,440191998016208378,6599400854146523778
%N Number of base 26 circular n-digit numbers with adjacent digits differing by 8 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(8) for base>=8.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]`-$[(i+1)mod N]`>8)+($[(i+1)mod N]`-$[i]`>8))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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