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%I #8 Mar 31 2012 12:35:02
%S 1,23,289,3047,37137,462163,5880121,75773539,985257889,12888815603,
%T 169303842569,2230130203467,29431207313841,388895110406371,
%U 5143074692086361,68054649404120347,900857522223771201
%N Number of base 23 circular n-digit numbers with adjacent digits differing by 7 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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