%I #7 Mar 31 2012 12:35:06
%S 1,26,256,2596,26586,273768,2828090,29270910,303304140,3144995160,
%T 32624286682,338508404178,3512870407964,36458032099558,
%U 378396656960160,3927490056266692,40765343764050602,423128260660074728
%N Number of base 26 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 26 differing by four or less A126521, three or less A126494, two or less A126413, one or less A126380.
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006
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