A125341 - OEIS

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

%S 1,31,205,1063,6469,39801,250945,1602569,10342789,67284109,440527075,

%T 2899382011,19166086465,127164179745,846390009243,5648944475703,

%U 37792538921349,253375101591149,1701917024018695,11450987830940417

%N Number of base 31 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