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%I #7 Mar 31 2012 12:35:01
%S 1,12,88,552,3968,29112,218008,1650528,12582880,96324600,739228968,
%T 5681576176,43706415776,336396570496,2589969578592,19944309195072,
%U 153600126376320,1183021908352864,9111943178894368,70184192846874336
%N Number of base 12 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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