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Number of base 27 circular n-digit numbers with adjacent digits differing by 3 or less.
0

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

%S 1,27,177,915,5545,33997,213621,1359805,8748521,56739057,370374447,

%T 2430484743,16019733493,105982096949,703383900487,4681112144755,

%U 31228495404521,208772665807697,1398339225679299,9381662291084581

%N Number of base 27 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