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%I #7 Mar 31 2012 12:35:02
%S 1,28,232,1528,11792,92328,740584,6020560,49474064,409888240,
%T 3418201292,28657884404,241330103336,2039837966168,17296465194604,
%U 147063357683748,1253373089577936,10704229282080880,91584291381177844
%N Number of base 28 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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