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Search: id:A067403
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A067403 Third column of triangle A067402. +0
6
1, 5, 45, 405, 3645, 32805, 295245, 2657205, 23914845, 215233605, 1937102445, 17433922005, 156905298045, 1412147682405, 12709329141645, 114383962274805, 1029455660473245, 9265100944259205, 83385908498332845 (list; graph; listen)
OFFSET

0,2

FORMULA

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

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

CROSSREFS

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

Sequence in context: A125836 A001260 A088505 this_sequence A022022 A058410 A005979

Adjacent sequences: A067400 A067401 A067402 this_sequence A067404 A067405 A067406

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Jan 25 2002

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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