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A156577 a(2n+2)=10*a(2n+1), a(2n+1)=10*a(2n)-9^n*A000108(n), a(0)=1 . 1
1, 9, 90, 891, 8910, 88938, 889380, 8890155, 88901550, 888923646, 8889236460, 88889884542, 888898845420, 8888918303988, 88889183039880, 888889778505099, 8888897785050990, 88888916293698870, 888889162936988700 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Hankel transform is 9^C(n+1,2).

LINKS

Table of n, a(n) for n=0..18.

FORMULA

a(n)=sum{k=0..n, A120730(n,k)*9^k}.

CROSSREFS

Cf. A000108, A156273, A001405, A151281, A151162, A151254, A156195, A156361, A156362, A156566

Sequence in context: A242161 A227713 A057092 * A173480 A052268 A155199

Adjacent sequences:  A156574 A156575 A156576 * A156578 A156579 A156580

KEYWORD

nonn

AUTHOR

Philippe Deléham, Feb 10 2009

STATUS

approved

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Last modified February 23 03:41 EST 2018. Contains 299473 sequences. (Running on oeis4.)