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A067403 Third column of triangle A067402. 9
1, 5, 45, 405, 3645, 32805, 295245, 2657205, 23914845, 215233605, 1937102445, 17433922005, 156905298045, 1412147682405, 12709329141645, 114383962274805, 1029455660473245, 9265100944259205, 83385908498332845 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

FORMULA

a(n) = A067402(n+2, 2). a(n) = 5*9^(n-1) for n>=1, a(0)=1.

G.f.: (1-4*x)/(1-9*x).

MAPLE

A067403:=n->5*9^(n-1): 1, seq(A067403(n), n=1..30); # Wesley Ivan Hurt, Apr 09 2017

MATHEMATICA

Join[{1}, NestList[9#&, 5, 30]] (* or *) CoefficientList[Series[ (1-4x)/ (1-9x), {x, 0, 30}], x] (* Harvey P. Dale, Apr 26 2011 *)

PROG

(PARI) Vec((1-4*x)/(1-9*x) + O(x^30)) \\ Michel Marcus, Apr 09 2017

CROSSREFS

Cf. A002001 (second column), A067404 (fourth column), A001019 (powers of 9).

Cf. A067402.

Sequence in context: A125836 A001260 A088505 * A173292 A173558 A022022

Adjacent sequences:  A067400 A067401 A067402 * A067404 A067405 A067406

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Jan 25 2002

STATUS

approved

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Last modified September 24 23:13 EDT 2020. Contains 337325 sequences. (Running on oeis4.)