%I
%S 1,23,257,2375,25485,278903,3123797,35463983,406719021,4698846899,
%T 54583098727,636626661991,7447641422289,87321630757865,
%U 1025514521755099,12058435600011515,141915563933099549
%N Number of base 23 circular ndigit numbers with adjacent digits differing by 6 or less.
%C [Empirical] a(base,n)=a(base1,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..M1) init $[]:=0 asgn $[]>{*} kill +[i in 0..N1](($[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
