%I #7 Mar 31 2012 12:35:06
%S 1,29,241,2049,17561,151221,1306137,11305233,98001277,850500103,
%T 7387286529,64205640387,558304969573,4856561584969,42257794378689,
%U 367769781530795,3201211717021261,27867955430533517,242624946286670611
%N Number of base 29 n-digit numbers with adjacent digits differing by four or less.
%C [Empirical] a(base,n)=a(base-1,n)+9^(n-1) for base>=4n-3; a(base,n)=a(base-1,n)+9^(n-1)-2 when base=4n-4
%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))
%Y Cf. Base 29 differing by three or less A126497, two or less A126416, one or less A126383.
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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