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%I #7 Mar 31 2012 12:35:06
%S 1,25,245,2475,25255,259127,2667039,27499769,283843569,2931488329,
%T 30286288971,312960372023,3234309867213,33427353913483,
%U 345492390255623,3570953641573985,36909251330677927,381495392831876277
%N Number of base 25 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 25 differing by four or less A126520, three or less A126493, two or less A126412, one or less A126379.
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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