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 A069015 a(n) = n! * 3^n * Sum_{i=1..n} 1/(i * 3^i). 2
 1, 7, 65, 786, 11814, 212772, 4468932, 107259408, 2896044336, 86881692960, 2867099496480, 103215621790080, 4025409728814720, 169067214837239040, 7608024754854048000, 365185189540668672000, 18624444687496892160000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA E.g.f.: -log(1-x)/(1-3*x). - Vladeta Jovovic, Feb 07 2003 a(n) ~ n! * 3^n * log(3/2). - Vaclav Kotesovec, Oct 05 2013 MATHEMATICA Rest[CoefficientList[Series[-Log[1-x]/(1-3*x), {x, 0, 20}], x]* Range[0, 20]!] (* Vaclav Kotesovec, Oct 05 2013 *) CROSSREFS Cf. A000254, A068102. Sequence in context: A051550 A300488 A085283 * A097819 A152525 A272646 Adjacent sequences:  A069012 A069013 A069014 * A069016 A069017 A069018 KEYWORD easy,nonn AUTHOR Benoit Cloitre, Apr 14 2002 STATUS approved

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Last modified January 16 05:22 EST 2022. Contains 350374 sequences. (Running on oeis4.)