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 A320963 a(n) = Sum_{j=0..n} Sum_{k=0..j} abs( Stirling1(j - k, k) ). 1
 1, 1, 2, 3, 6, 15, 51, 227, 1257, 8296, 63394, 549740, 5330185, 57117590, 670163058, 8543228103, 117564576721, 1736762231296, 27411856376831, 460320540171210, 8194312180092795, 154127845115561811, 3054239953905841713, 63597989583700047353, 1388275729125313815336 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS MAPLE a := n -> add(add(abs(Stirling1(j - k, k)), k=0..j), j=0..n): seq(a(n), n=0..29); MATHEMATICA a[n_] := Sum[Sum[Abs[StirlingS1[j - k, k]], {k, 0, j}], {j, 0, n}]; Array[a, 25, 0] (* Amiram Eldar, Nov 06 2018 *) PROG (PARI) a(n)={sum(j=0, n, sum(k=0, j, abs(stirling(j-k, k, 1))))} \\ Andrew Howroyd, Nov 06 2018 CROSSREFS The Stirling_2 counterpart: A320964. Sequence in context: A216144 A121688 A082094 * A061059 A060796 A059842 Adjacent sequences:  A320960 A320961 A320962 * A320964 A320965 A320966 KEYWORD nonn AUTHOR Peter Luschny, Nov 06 2018 STATUS approved

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Last modified June 12 21:19 EDT 2021. Contains 344967 sequences. (Running on oeis4.)