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A126382 Number of base 28 n-digit numbers with adjacent digits differing by one or less. 4
1, 28, 82, 242, 716, 2122, 6296, 18696, 55554, 165162, 491240, 1461628, 4350278, 12951392, 38567446, 114873170, 342215676, 1019662794, 3038656824, 9056682732, 26996898534, 80484319380, 239970228042, 715564197870 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

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

LINKS

Table of n, a(n) for n=0..23.

PROG

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

CROSSREFS

Sequence in context: A043238 A044018 A124783 * A165009 A179790 A306427

Adjacent sequences:  A126379 A126380 A126381 * A126383 A126384 A126385

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 26 2006

STATUS

approved

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Last modified April 17 02:26 EDT 2021. Contains 343059 sequences. (Running on oeis4.)