|
%I #8 Mar 31 2012 12:35:02
%S 1,20,218,1994,21078,227450,2509508,28044008,316237326,3587876114,
%T 40876370578,467018577782,5345948876388,61273602792708,
%U 702905295827666,8068104827974874,92643421204990558,1064070251138125106
%N Number of base 20 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
|
