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 A108398 a(n) = n*(1 + n^n)/2. 4
 0, 1, 5, 42, 514, 7815, 139971, 2882404, 67108868, 1743392205, 50000000005, 1569214188366, 53496602689542, 1968688192849651, 77784047778906119, 3284204177856445320, 147573952589676412936, 7031542226033862495513 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..100 FORMULA a(n) = A108396(n,n). E.g.f.: (exp(x) * x - LambertW(-x)/(1 + LambertW(-x))^3) / 2. - Vaclav Kotesovec, Jan 03 2019 PROG (Magma) [n*(1+n^n)/2: n in [0..25]]; // Vincenzo Librandi, Apr 29 2011 (Haskell) a108398 n = n * (1 + n ^ n) `div` 2 -- Reinhard Zumkeller, Mar 31 2015 CROSSREFS Cf. A000312, A000217. Cf. A108396, A256512. Sequence in context: A347015 A102693 A052654 * A370907 A239997 A102244 Adjacent sequences: A108395 A108396 A108397 * A108399 A108400 A108401 KEYWORD nonn AUTHOR Reinhard Zumkeller, Jun 02 2005 STATUS approved

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Last modified April 20 16:11 EDT 2024. Contains 371844 sequences. (Running on oeis4.)