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%I A125476 #8 Mar 31 2012 12:35:02
%S A125476 1,19,271,3439,49051,712519,10458163,154101799,2274460507,33592425049,
%T A125476 496277475271,7332583525319,108345196911631,1600923503226079,
%U A125476 23655650115244789,349542980141854759,5164958667871471243
%N A125476 Number of base 19 circular n-digit numbers with adjacent digits differing by 9 or less.
%C A125476 [Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
%o A125476 (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
%K A125476 nonn,base
%O A125476 0,2
%A A125476 _R. H. Hardin_, Dec 28 2006

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