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A126494 Number of base 26 n-digit numbers with adjacent digits differing by three or less. 2
1, 26, 170, 1134, 7618, 51394, 347682, 2356702, 15997846, 108719102, 739490656, 5033426494, 34279838804, 233566488998, 1591993821168, 10854281793638, 74022763799812, 504910336091974, 3444546058508588, 23502038289723148 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[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

LINKS

Table of n, a(n) for n=0..19.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))

CROSSREFS

Cf. Base 26 differing by two or less A126413, one or less A126380.

Sequence in context: A268331 A125336 A321113 * A027001 A173893 A252936

Adjacent sequences:  A126491 A126492 A126493 * A126495 A126496 A126497

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 27 2006

STATUS

approved

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Last modified October 3 14:56 EDT 2022. Contains 357237 sequences. (Running on oeis4.)