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A126379 Number of base 25 n-digit numbers with adjacent digits differing by one or less. 4
1, 25, 73, 215, 635, 1879, 5567, 16509, 48993, 145479, 432191, 1284481, 3818837, 11357069, 33784477, 100524263, 299168955, 890522631, 2651236335, 7894421265, 23510114133, 70023966177, 208589168433, 621421019043, 1851508693479 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[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

LINKS

Table of n, a(n) for n=0..24.

PROG

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

CROSSREFS

Sequence in context: A235941 A069190 A124718 * A114553 A098439 A318643

Adjacent sequences:  A126376 A126377 A126378 * A126380 A126381 A126382

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 26 2006

STATUS

approved

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Last modified July 14 18:26 EDT 2020. Contains 335729 sequences. (Running on oeis4.)