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A248045 (2*(n-1))! * (2*n-1)! / (n * (n-1)!^3). 6
1, 6, 120, 4200, 211680, 13970880, 1141620480, 111307996800, 12614906304000, 1629845894476800, 236475822507724800, 38072607423743692800, 6735922851893114880000, 1299070835722243584000000, 271245990498804460339200000, 60962536364606302461235200000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Central terms in triangles of Lah numbers: a(n) = - A008297(2*n-1,n) = A105278(2*n-1,n) = A000891(n-1)*A000142(n) = A000894(n-1)*A000142(n-1).
a(n) = n * A204515(n-1). - Reinhard Zumkeller, Oct 19 2014
LINKS
FORMULA
n*a(n) = 4*(2*n-1)*(2*n-3)*a(n-1). - R. J. Mathar, Oct 07 2014
PROG
(Haskell)
a248045 n = a000891 (n - 1) * a000142 n
CROSSREFS
Cf. A187535 (Central Lah numbers).
Sequence in context: A356506 A354429 A029697 * A280627 A196688 A126448
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Sep 30 2014
STATUS
approved

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Last modified February 29 09:21 EST 2024. Contains 370418 sequences. (Running on oeis4.)