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%I #7 Mar 31 2012 12:35:01
%S 1,22,142,730,4390,26742,166966,1056350,6755686,43557742,282683662,
%T 1844363158,12086792278,79504493454,524626264542,3471321731070,
%U 23023441009542,153019621221454,1018866986428048,6795005681508340
%N Number of base 22 circular n-digit numbers with adjacent digits differing by 3 or less.
%C [Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1
%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006