A125479 - OEIS

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

%S 1,22,328,4252,62788,946972,14517082,224253702,3478257820,54059966464,

%T 841094239878,13093151507282,203873447467294,3174946219127354,

%U 49447242369205904,770128096546157332,11994759635204143948

%N Number of base 22 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