A125335 - OEIS

%I #7 Mar 31 2012 12:35:01

%S 1,25,163,841,5083,31095,194959,1238423,7951387,51466531,335298133,

%T 2196036109,14446557007,95391055551,631880846109,4197195979281,

%U 27946473646107,186471447915971,1246550326511095,8346999521414075

%N Number of base 25 circular n-digit numbers with adjacent digits differing by 3 or less.

%C [Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1

%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))

%K nonn,base

%O 0,2

%A _R. H. Hardin_, Dec 28 2006