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%I #7 Mar 31 2012 12:35:01
%S 1,26,170,878,5314,32546,204290,1299114,8349954,54102794,352836290,
%T 2313260426,15233145250,100686576250,667632373298,4439154062018,
%U 29587484525314,197622056861834,1322444776094468,8864330906128944
%N Number of base 26 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
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