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Number of base 31 circular n-digit numbers with adjacent digits differing by 4 or less.
0

%I #7 Mar 31 2012 12:35:02

%S 1,31,259,1711,13259,104181,838567,6839941,56392139,468718939,

%T 3921391169,32982034061,278635097351,2362736395895,20099255075641,

%U 171451320170481,1466033625495387,12562096168712455,107842286116562887

%N Number of base 31 circular n-digit numbers with adjacent digits differing by 4 or less.

%C [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1

%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))

%K nonn,base

%O 0,2

%A _R. H. Hardin_, Dec 28 2006