A125439 - OEIS

%I #8 Mar 31 2012 12:35:02

%S 1,27,349,3723,46157,583687,7554133,99104599,1313531925,17539619163,

%T 235514695099,3175602492309,42952775347889,582333628754047,

%U 7908808568321989,107551307959489303,1463999937423331797

%N Number of base 27 circular n-digit numbers with adjacent digits differing by 7 or less.

%C [Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))

%K nonn,base

%O 0,2

%A _R. H. Hardin_, Dec 28 2006