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A101818
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Triangle read by rows: (1/n)*T(n,h), where T(n,h) is the array in A101817.
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2
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1, 1, 1, 1, 6, 2, 1, 21, 36, 6, 1, 60, 300, 240, 24, 1, 155, 1800, 3900, 1800, 120, 1, 378, 9030, 42000, 50400, 15120, 720, 1, 889, 40572, 357210, 882000, 670320, 141120, 5040, 1, 2040, 169400, 2610720, 11677680, 17781120, 9313920, 1451520, 40320, 1
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history;
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OFFSET
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0,5
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COMMENTS
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Column 2 is A066524.
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LINKS
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Table of n, a(n) for n=0..45.
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FORMULA
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T(n, h)=(1/n)*C(n, h)*U(n, h), where U(n, h) is the array in A019538.
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EXAMPLE
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First rows:
1
1 1
1 6 2
1 21 36 6
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CROSSREFS
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Cf. A066524, A090657, A101817, A101819, A101820, A101821.
Sequence in context: A002247 A124913 A181415 * A138186 A110321 A111553
Adjacent sequences: A101815 A101816 A101817 * A101819 A101820 A101821
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KEYWORD
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nonn,tabl
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AUTHOR
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Clark Kimberling, Dec 17 2004
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STATUS
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approved
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