%I #7 Mar 31 2012 12:35:01
%S 1,10,70,430,2990,21210,152752,1107368,8054662,58680898,427841510,
%T 3120550894,22764484280,166081792328,1211725839660,8840879076060,
%U 64504607657222,470639150157006,3433889688841786,25054462942728214
%N Number of base 10 circular n-digit numbers with adjacent digits differing by 4 or less.
%C [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006