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A126377 Number of base 23 n-digit numbers with adjacent digits differing by one or less. 4
1, 23, 67, 197, 581, 1717, 5081, 15051, 44619, 132357, 392825, 1166383, 3464543, 10294187, 30595831, 90958325, 270471141, 804429189, 2392956009, 7119580287, 21185591199, 63050397375, 187668462027, 558658899825, 1663222335825 (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..24.

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: A069173 A124716 A139955 * A136064 A142302 A276262

Adjacent sequences:  A126374 A126375 A126376 * A126378 A126379 A126380

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 26 2006

STATUS

approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)