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%I #7 Mar 31 2012 12:35:06
%S 1,28,278,2838,29248,303050,3150192,32813808,342256684,3572874122,
%T 37318284692,389922817124,4075058667258,42594362751624,
%U 445257076027562,4654740529039096,48662762737708064,508755029491780946
%N Number of base 28 n-digit numbers with adjacent digits differing by five or less.
%C [Empirical] a(base,n)=a(base-1,n)+11^(n-1) for base>=5n-4; a(base,n)=a(base-1,n)+11^(n-1)-2 when base=5n-5
%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>5)+($[i+1]`-$[i]`>5))
%Y Cf. Base 28 differing by four or less A126523, three or less A126496, two or less A126415, one or less A126382.
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006