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%I #8 Mar 31 2012 12:35:02
%S 1,28,278,2218,20698,196378,1908368,18800964,187240242,1880087458,
%T 19001528288,193056703076,1969968657844,20174161922072,
%U 207225426515028,2134025764850968,22024156859681682,227721370771551778
%N Number of base 28 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