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A066999
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a(n)=3^n*sum(i=1,n,i^3/3^i).
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1
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1, 11, 60, 244, 857, 2787, 8704, 26624, 80601, 242803, 729740, 2190948, 6575041, 19727867, 59186976, 177565024, 532699985, 1598105787, 4794324220, 14382980660, 43148951241, 129446864371, 388340605280, 1165021829664
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,200
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FORMULA
| Conjecture: G.f.:(-1-x^2-4*x)/((3*x-1)*(x-1)^4) [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 27 2009]
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PROG
| (PARI) { s=0; for (n=1, 200, s+=n^3/3^n; write("b066999.txt", n, " ", 3^n*s) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Apr 25 2010]
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CROSSREFS
| Sequence in context: A044149 A044530 A050483 * A055826 A156704 A073625
Adjacent sequences: A066996 A066997 A066998 * A067000 A067001 A067002
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KEYWORD
| nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 27 2002
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