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%I #5 Mar 31 2012 12:35:06
%S 1,28,184,1232,8304,56196,381296,2592000,17644932,120248704,820197868,
%T 5598376276,38234454860,261248031956,1785751586164,12210406222304,
%U 83513470631012,571321692051188,3909186587411576,26752234815389416
%N Number of base 28 n-digit numbers with adjacent digits differing by three or less.
%C [Empirical] a(base,n)=a(base-1,n)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
%Y Cf. Base 28 differing by two or less A126415, one or less A126382.
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 27 2006
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