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 A038561 Left-hand border of triangle A046937. 3
 1, 2, 3, 8, 24, 83, 324, 1400, 6609, 33758, 185136, 1083233, 6726366, 44130128, 304741623, 2207682188, 16729947276, 132281116715, 1088831511000, 9311082630620, 82569723552561, 758057178490082, 7194283782101844, 70481938088367569 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS For n>1: a(n) is the number of entries in the last blocks of all set partitions of [n]. a(3) = 8 because the number of entries in the last blocks of all set partitions of [3] (123, 12|3, 13|2, 1|23, 1|2|3) is 3+1+1+2+1 = 8. - Alois P. Heinz, May 08 2017 REFERENCES H. W. Gould, A linear binomial recurrence and the Bell numbers and polynomials, preprint, 1998 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..500 R. K. Guy, Letters to N. J. A. Sloane, June-August 1968 MATHEMATICA a[0, 0] = 1; a[1, 0] = 2; a[n_, 0] := a[n-1, n-1]; a[n_, k_] := a[n, k] = a[n, k-1] + a[n-1, k-1]; a[n_] := a[n, 0]; Table[a[n], {n, 0, 23}] (* Jean-François Alcover, Jun 06 2013 *) PROG (Haskell) a038561 = head . a046937_row  -- Reinhard Zumkeller, Jan 06 2014 CROSSREFS A040027(n) + B(n), where B(n) = Bell numbers A000110. Related to A000110, A040027, A038559, A038560. Column k=1 of A286416 (for n>1). Sequence in context: A331874 A089847 A304121 * A055981 A182212 A120260 Adjacent sequences:  A038558 A038559 A038560 * A038562 A038563 A038564 KEYWORD nonn,nice,easy AUTHOR STATUS approved

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Last modified February 23 16:23 EST 2020. Contains 332177 sequences. (Running on oeis4.)