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A126520 Number of base 25 n-digit numbers with adjacent digits differing by four or less. 1
1, 25, 205, 1725, 14645, 124977, 1069941, 9179469, 78869491, 678323799, 5838030793, 50269401543, 432996699399, 3730477803939, 32144938184273, 277017865876053, 2387456054541987, 20577155216208681, 177357954676723141 (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 25 differing by three or less A126493, two or less A126412, one or less A126379.

Sequence in context: A042210 A220677 A125362 * A324794 A348201 A264493

Adjacent sequences:  A126517 A126518 A126519 * A126521 A126522 A126523

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified August 17 23:13 EDT 2022. Contains 356204 sequences. (Running on oeis4.)