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A367369
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a(n) = A340556(2*n, n), the central terms of the second order Eulerian numbers.
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0
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1, 1, 22, 1452, 195800, 44765000, 15548960784, 7634832149392, 5036317938475648, 4297211671488276816, 4605775111899791292320, 6058134671618508819536768, 9595073255473201184093573376, 18012849924775292436074080925056, 39551575929026035832580350736305920
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OFFSET
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0,3
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LINKS
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MAPLE
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A340556 := (n, k) -> `if`(k=0, k^n, combinat:-eulerian2(n, k-1)):
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CROSSREFS
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Indexing the second-order Eulerian numbers comes in three flavors: A008517 (following Riordan and Comtet), A201637 (following Graham, Knuth, and Patashnik) and indexing like in A340556 using the definition of Gessel and Stanley.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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