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%I #8 Mar 31 2012 12:35:02
%S 1,11,101,851,7861,73361,687911,6458645,60663405,569855705,5353272231,
%T 50289664667,472432405351,4438140914777,41692951349661,
%U 391673541192251,3679474891298093,34565867184632063,324720024734460965
%N Number of base 11 circular n-digit numbers with adjacent digits differing by 6 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(6) for base>=6.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]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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