%I #7 Mar 31 2012 12:35:02
%S 1,16,124,796,5924,44916,348652,2743036,21801764,174565444,1405459324,
%T 11362215276,92138276228,748875775404,6097017988948,49701864868956,
%U 405539673414148,3311264043438796,27050524930821556,221065493126829404
%N Number of base 16 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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