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 A187648 Partial sums of the (signless) central Stirling numbers of the first kind. 1
 1, 2, 13, 238, 7007, 276332, 13615867, 804559020, 55435688573, 4363540990502, 386285596492697, 37986820683352442, 4108370877690921963, 484652929620424467088, 61930188031979540102743, 8521504634108297687933368 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..250 FORMULA a(n) = Sum_{k=0..n} A132393(2*k,k). a(n) ~ n^n * c^(2*n) * 2^(3*n-1) / (sqrt(Pi*(c-1)*n) * exp(n) * (2*c-1)^n), where c = -LambertW(-1,-exp(-1/2)/2). - Vaclav Kotesovec, May 21 2014 MAPLE seq(add(abs(combinat[stirling1](2*k, k)), k=0..n), n=0..15); MATHEMATICA Flatten[Table[Sum[Abs[StirlingS1[2k, k]], {k, 0, n}], {n, 0, 15}], 1] PROG (Maxima) makelist(sum(abs(stirling1(2*k, k)), k, 0, n), n, 0, 12); CROSSREFS Cf. A132393. Sequence in context: A236903 A277452 A268703 * A113098 A135870 A133067 Adjacent sequences:  A187645 A187646 A187647 * A187649 A187650 A187651 KEYWORD nonn,easy AUTHOR Emanuele Munarini, Mar 12 2011 STATUS approved

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Last modified August 21 22:32 EDT 2019. Contains 326169 sequences. (Running on oeis4.)