

A126522


Number of base 27 ndigit numbers with adjacent digits differing by four or less.


1



1, 27, 223, 1887, 16103, 138099, 1188039, 10242351, 88435341, 764407997, 6612526647, 57234605067, 495599614141, 4292742043159, 37190688714579, 322257543592553, 2792687844075253, 24203507849388273, 209778422093025849
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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 27 differing by three or less A126495, two or less A126414, one or less A126381.
Sequence in context: A160441 A222994 A125364 * A027500 A069979 A183806
Adjacent sequences: A126519 A126520 A126521 * A126523 A126524 A126525


KEYWORD

nonn,base


AUTHOR

R. H. Hardin, Dec 28 2006


STATUS

approved



