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A126498 Number of base 30 n-digit numbers with adjacent digits differing by three or less. 2
1, 30, 198, 1330, 8990, 60998, 414910, 2827298, 19292018, 131778306, 900905082, 6163326750, 42189104748, 288930449010, 1979525532152, 13566774085658, 93007355721960, 637770486097522, 4374235089178342, 30006615117630438 (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 30 differing by two or less A126417, one or less A126384.

Sequence in context: A319334 A064247 A125340 * A029545 A200548 A165030

Adjacent sequences:  A126495 A126496 A126497 * A126499 A126500 A126501

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 27 2006

STATUS

approved

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Last modified September 18 23:30 EDT 2020. Contains 337175 sequences. (Running on oeis4.)