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A126526 Number of base 31 n-digit numbers with adjacent digits differing by four or less. 1
1, 31, 259, 2211, 19019, 164343, 1424235, 12368115, 107567215, 936593437, 8162112673, 71178552195, 621048996119, 5421039243545, 47334756754423, 413416811445643, 3611458265770503, 31553302705135081, 275714829055325817 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+9^(n-1) for base>=4n-3; a(base,n)=a(base-1,n)+9^(n-1)-2 when base=4n-4

LINKS

Table of n, a(n) for n=0..18.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))

CROSSREFS

Cf. Base 31 differing by three or less A126499, two or less A126418, one or less A126385.

Sequence in context: A089705 A180471 A125368 * A008386 A161558 A156094

Adjacent sequences:  A126523 A126524 A126525 * A126527 A126528 A126529

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified October 20 07:01 EDT 2014. Contains 248329 sequences.