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%I #7 Mar 31 2012 12:35:06
%S 1,31,311,3201,33241,346973,3633345,38128475,400712365,4215612885,
%T 44381119457,467467444891,4925548461045,51911345979157,
%U 547195680951947,5768641876348183,60819051384616763,641254077894118141
%N Number of base 31 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 31 differing by four or less A126526, three or less A126499, two or less A126418, one or less A126385.
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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