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A126381 Number of base 27 n-digit numbers with adjacent digits differing by one or less. 4
1, 27, 79, 233, 689, 2041, 6053, 17967, 53367, 158601, 471557, 1402579, 4173131, 12419951, 36973123, 110090201, 327866769, 976616073, 2909516661, 8669262243, 25834637067, 76997534979, 229509874839, 684183138261, 2039795051133 (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: A255186 A121737 A124726 * A129254 A215782 A216438

Adjacent sequences:  A126378 A126379 A126380 * A126382 A126383 A126384

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 26 2006

STATUS

approved

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Last modified December 15 09:05 EST 2019. Contains 329995 sequences. (Running on oeis4.)