%I A126480
%S A126480 1,12,72,448,2816,17780,112440,711504,4503320,28505304,180439880,
%T A126480 1142206528,7230339936,45769222384,289726772704,1834018988272,
%U A126480 11609648360160,73491027329888,465210573030272,2944861245639136
%N A126480 Number of base 12 n-digit numbers with adjacent digits differing by three 
               or less.
%C A126480 [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 A126480 (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 A126480 Cf. Base 12 differing by two or less A126399, one or less A126366.
%Y A126480 Sequence in context: A035472 A036398 A125322 this_sequence A030235 A088166 
               A138402
%Y A126480 Adjacent sequences: A126477 A126478 A126479 this_sequence A126481 A126482 
               A126483
%K A126480 nonn,base
%O A126480 0,2
%A A126480 Ron Hardin (rhhardin(AT)att.net), Dec 27 2006