|
%I #8 Mar 31 2012 12:35:02
%S 1,20,268,3116,41308,559340,7702750,106934246,1491033780,20837241344,
%T 291544100378,4081622919042,57160810856050,800635091767934,
%U 11215210012054526,157108281806511326,2200900956018966740
%N Number of base 20 circular n-digit numbers with adjacent digits differing by 8 or less.
%C [Empirical] a(base,n)=a(base-1,n)+F(8) for base>=8.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]`-$[(i+1)mod N]`>8)+($[(i+1)mod N]`-$[i]`>8))
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
|
