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 A054127 a(1) = 2; a(n) = 9*2^(n-2) - n - 2, n>1. 1
 2, 5, 13, 30, 65, 136, 279, 566, 1141, 2292, 4595, 9202, 18417, 36848, 73711, 147438, 294893, 589804, 1179627, 2359274, 4718569, 9437160, 18874343, 37748710, 75497445, 150994916, 301989859, 603979746, 1207959521 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Second column of A054126. LINKS FORMULA a(n) = A054126(n, 1). G.f.: x * (2-x) * (1-x+x^2) / ( (1-x)^2 * (1-2*x) ). - Joerg Arndt, Dec 01 2014 MATHEMATICA s=5; lst={2, s}; Do[s+=s+n++; AppendTo[lst, s], {n, 3, 5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Oct 25 2008 *) CROSSREFS Cf. A054126. Sequence in context: A116699 A290198 A282153 * A184052 A295057 A018012 Adjacent sequences:  A054124 A054125 A054126 * A054128 A054129 A054130 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified February 21 23:44 EST 2019. Contains 320381 sequences. (Running on oeis4.)