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A126380 Number of base 26 n-digit numbers with adjacent digits differing by one or less. 4

%I #5 Mar 31 2012 12:35:05

%S 1,26,76,224,662,1960,5810,17238,51180,152040,451874,1343530,3995984,

%T 11888510,35378800,105307232,313517862,933569352,2780376498,

%U 8281841754,24672375600,73510750578,219049521636,652802078652,1945651872306

%N Number of base 26 n-digit numbers with adjacent digits differing by one or less.

%C [Empirical] a(base,n)=a(base-1,n)+3^(n-1) for base>=n; a(base,n)=a(base-1,n)+3^(n-1)-2 when base=n-1

%o (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>1)+($[i+1]`-$[i]`>1))

%K nonn,base

%O 0,2

%A _R. H. Hardin_, Dec 26 2006

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)