

A317275


a(1) = 1; a(n) = Sum_{k=1..n1} Stirling1(n1,k)*a(k)*a(nk).


0



1, 1, 2, 9, 97, 3105, 409318, 301069244, 1523141657289, 61447697339843710, 22299766257043761657829, 80922067241038150103930448880, 3230152742688615187688660954252643194, 1547248455508510864175770056662224501358437847
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OFFSET

1,3


LINKS

Table of n, a(n) for n=1..14.


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



