A125474 - OEIS

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

%S 1,17,233,2897,39897,556757,7818749,110011877,1548942297,21813695351,

%T 307225177353,4327088149379,60945065497509,858386080729805,

%U 12090025897059343,170283256501541477,2398372933663761385

%N Number of base 17 circular n-digit numbers with adjacent digits differing by 9 or less.

%C [Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))

%K nonn,base

%O 0,2

%A _R. H. Hardin_, Dec 28 2006