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%I #8 Mar 31 2012 12:35:02
%S 1,22,212,1672,15352,143572,1374890,13348434,130975440,1295298664,
%T 12888294202,128849609746,1292978243302,13012965716110,
%U 131270937263076,1326645978732772,13426630671484000,136041420998930404
%N Number of base 22 circular n-digit numbers with adjacent digits differing by 5 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(5) for base>=5.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]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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