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A126415 Number of base 28 n-digit numbers with adjacent digits differing by two or less. 3
1, 28, 134, 650, 3168, 15486, 75848, 372024, 1826730, 8977530, 44151860, 217269760, 1069715430, 5268960200, 25962370558, 127969407686, 630947807506, 3111658441818, 15349331786976, 75731342285276, 373715745367376 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+5^(n-1) for base>=2n-1; a(base,n)=a(base-1,n)+5^(n-1)-2 when base=2n-2

LINKS

Table of n, a(n) for n=0..20.

PROG

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

CROSSREFS

Cf. Base 28 differing by one or less A126382.

Sequence in context: A192796 A124956 A014705 * A187047 A074233 A201095

Adjacent sequences:  A126412 A126413 A126414 * A126416 A126417 A126418

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified July 11 21:16 EDT 2020. Contains 335652 sequences. (Running on oeis4.)