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%I #7 Mar 31 2012 12:35:02
%S 1,31,259,1711,13259,104181,838567,6839941,56392139,468718939,
%T 3921391169,32982034061,278635097351,2362736395895,20099255075641,
%U 171451320170481,1466033625495387,12562096168712455,107842286116562887
%N Number of base 31 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
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