%I #8 Mar 31 2012 12:35:02
%S 1,18,192,1740,18140,193148,2099982,23097358,255965684,2849912436,
%T 31823439562,355996289370,3986819767538,44679136012334,
%U 500916612375126,5617436087092970,63005662878411156,706745727675422268
%N Number of base 18 circular n-digit numbers with adjacent digits differing by 6 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(6) for base>=6.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]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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