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Search: id:A055981
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| A055981 |
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a(n)=Ceiling[n!/d(n!)]. |
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+0
1
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| 1, 1, 2, 3, 8, 24, 84, 420, 2268, 13440, 73920, 604800, 3931200, 33633600, 324324000, 3891888000, 33081048000, 435891456000, 4140968832000, 59281238016000, 840311548876800, 11708340914350080, 134645920515025920
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OFFSET
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1,3
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COMMENT
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The ceiling function is required only for n = 3 and 5.
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FORMULA
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a(n)=Ceiling(A000142(n)/A027423(n))
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EXAMPLE
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For n=3 n!=6, d(n!)=4, quotient is 3/2, for n=5 n!=120, d(n!)=16, quotient=15/2. All other cases give integers.
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CROSSREFS
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A000142, A000005, A033950, A027423.
Sequence in context: A120708 A089847 A038561 this_sequence A120260 A002619 A129202
Adjacent sequences: A055978 A055979 A055980 this_sequence A055982 A055983 A055984
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jul 21 2000
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