

A126526


Number of base 31 ndigit 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
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OFFSET

0,2


COMMENTS

[Empirical] a(base,n)=a(base1,n)+9^(n1) for base>=4n3; a(base,n)=a(base1,n)+9^(n1)2 when base=4n4


LINKS

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


PROG

(S/R) stvar $[N]:(0..M1) init $[]:=0 asgn $[]>{*} kill +[i in 0..N2](($[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



