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 A317275 a(1) = 1; a(n) = Sum_{k=1..n-1} |Stirling1(n-1,k)|*a(k)*a(n-k). 0
 1, 1, 2, 9, 97, 3105, 409318, 301069244, 1523141657289, 61447697339843710, 22299766257043761657829, 80922067241038150103930448880, 3230152742688615187688660954252643194, 1547248455508510864175770056662224501358437847 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS MATHEMATICA a[n_] := a[n] = Sum[Abs[StirlingS1[n - 1, k]] a[k] a[n - k], {k, n - 1}]; a[1] = 1; Table[a[n], {n, 14}] CROSSREFS Cf. A008275, A137731, A143805. Sequence in context: A001142 A111847 A013132 * A013057 A237929 A227258 Adjacent sequences: A317272 A317273 A317274 * A317276 A317277 A317278 KEYWORD nonn AUTHOR Ilya Gutkovskiy, Jul 25 2018 STATUS approved

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)