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A126406 Number of base 19 n-digit numbers with adjacent digits differing by two or less. 3
1, 19, 89, 425, 2043, 9861, 47723, 231399, 1123605, 5461905, 26573735, 129379137, 630262495, 3071700043, 14976139061, 73039059807, 356304015623, 1738508587487, 8484132138387, 41409427571489, 202134928523711 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+5^(n-1) for base>=2n-1; a(base,n)=a(base-1,n)+5^(n-1)-2 when base=2n-2

LINKS

Table of n, a(n) for n=0..20.

PROG

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

CROSSREFS

Cf. Base 19 differing by one or less A126373.

Sequence in context: A142089 A174819 A124947 * A201306 A160296 A224097

Adjacent sequences:  A126403 A126404 A126405 * A126407 A126408 A126409

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified August 7 15:30 EDT 2020. Contains 336276 sequences. (Running on oeis4.)