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A126418 Number of base 31 n-digit numbers with adjacent digits differing by two or less. 3
1, 31, 149, 725, 3543, 17361, 85223, 418899, 2061105, 10149405, 50011235, 246566635, 1216199805, 6001382075, 29624479933, 146279954561, 722500541847, 3569422111283, 17638150070523, 87175432519409, 430936179702041 (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 31 differing by one or less A126385.

Sequence in context: A234122 A142758 A124994 * A142792 A201964 A226890

Adjacent sequences:  A126415 A126416 A126417 * A126419 A126420 A126421

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified February 26 17:22 EST 2021. Contains 341632 sequences. (Running on oeis4.)