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A126522 Number of base 27 n-digit 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 (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 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

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Last modified November 29 00:06 EST 2014. Contains 250479 sequences.