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A126499 Number of base 31 n-digit numbers with adjacent digits differing by three or less. 2
1, 31, 205, 1379, 9333, 63399, 431717, 2944947, 20115561, 137543107, 941258689, 6445801999, 44166431335, 302771722951, 2076414065529, 14244985903467, 97754711626643, 671000257052461, 4606822746884183, 31634499742407797 (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 31 differing by two or less A126418, one or less A126385.

Sequence in context: A137657 A228220 A125341 * A297758 A184058 A096906

Adjacent sequences:  A126496 A126497 A126498 * A126500 A126501 A126502

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 27 2006

STATUS

approved

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Last modified February 26 16:54 EST 2021. Contains 341632 sequences. (Running on oeis4.)