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A126417 Number of base 30 n-digit numbers with adjacent digits differing by two or less. 3
1, 30, 144, 700, 3418, 16736, 82098, 403274, 1982980, 9758780, 48058110, 236801010, 1167371680, 5757241450, 28403776808, 140176438936, 691982963722, 3416834220692, 16875210619810, 83360735329998, 411862694955416 (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 30 differing by one or less A126384.

Sequence in context: A218407 A229450 A124958 * A135175 A186895 A185480

Adjacent sequences:  A126414 A126415 A126416 * A126418 A126419 A126420

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified February 26 17:04 EST 2021. Contains 341632 sequences. (Running on oeis4.)