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A170739
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G.f.: (1+x)/(1-19*x).
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50
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1, 20, 380, 7220, 137180, 2606420, 49521980, 940917620, 17877434780, 339671260820, 6453753955580, 122621325156020, 2329805177964380, 44266298381323220, 841059669245141180, 15980133715657682420, 303622540597495965980, 5768828271352423353620, 109607737155696043718780
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OFFSET
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0,2
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..200
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FORMULA
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a(n)= Sum_{k, 0<=k<=n} A097805(n,k)*(-1)^(n-k)*20^k. [From Philippe DELEHAM, Dec 04 2009]
a(0) = 1; for n>0, a(n) = 20*19^(n-1). [From Vincenzo Librandi, Dec 05 2009]
a(0) = 1; for n>1, a(n) = 19*a(n-1). - Vincenzo Librandi, Dec 05 2012
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MATHEMATICA
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Join[{1}, 20*19^Range[0, 25]] (* From Vladimir Joseph Stephan Orlovsky, Jul 13 2011 *)
CoefficientList[Series[(1+x)/(1-19x), {x, 0, 30}], x] (* Vincenzo Librandi, Dec 05.2012 *)
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PROG
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(MAGMA) [1] cat [20*19^(n-1): n in [1..20]]; // Vincenzo Librandi, Dec 05 2012
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CROSSREFS
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Sequence in context: A170605 A170653 A170701 * A218722 A158534 A171325
Adjacent sequences: A170736 A170737 A170738 * A170740 A170741 A170742
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Dec 04 2009
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STATUS
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approved
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