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Search: id:A109901
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| A109901 |
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a(n) = n^2 choose T(n). |
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+0
1
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| 1, 4, 84, 8008, 3268760, 5567902560, 39049918716424, 1118770292985239888, 130276394656770614583240, 61448471214136179596720592960, 117118180539414377821494470432491764
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OFFSET
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1,2
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FORMULA
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C(n^2, n(n+1)/2) = (n^2!)/{(n(n+1)/2)!*(n(n-1)/2)!}
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EXAMPLE
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a(6) = 36!/{21!*15!} =5567902560.
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MAPLE
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seq(binomial(n^2, n*(n+1)/2), n=1..12); (Deutsch)
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CROSSREFS
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Sequence in context: A012107 A012189 A012076 this_sequence A015018 A059830 A116330
Adjacent sequences: A109898 A109899 A109900 this_sequence A109902 A109903 A109904
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 14 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 16 2005
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