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A126495 Number of base 27 n-digit numbers with adjacent digits differing by three or less. 2
1, 27, 177, 1183, 7961, 53795, 364489, 2474351, 16821389, 114483903, 779844261, 5315901159, 36257137597, 247407046293, 1688869025869, 11532291728235, 78767464674013, 538108605910885, 3676788059570219, 25126354998525521 (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 27 differing by two or less A126414, one or less A126381.

Sequence in context: A248234 A083560 A125337 * A224454 A258637 A228463

Adjacent sequences:  A126492 A126493 A126494 * A126496 A126497 A126498

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 27 2006

STATUS

approved

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Last modified October 2 08:34 EDT 2022. Contains 357191 sequences. (Running on oeis4.)