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Search: id:A162447
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| A162447 |
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Denominators of the column sums of the ZG1 matrix |
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+0
2
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| 12, 720, 181440, 7257600, 399168000, 1307674368000, 73229764608000, 731699852083200, 229909239772692480000, 84300054583320576000000, 51186993142992253747200000, 21777738900836704321536000000
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OFFSET
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2,1
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COMMENT
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For the definition of the ZG1 matrix coefficients see A162446.
We define the columns sums by cs(n) = sum(ZG1[2*m-1,n], m = 1.. infinity) for n => 2.
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FORMULA
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a(n) = denom(cs(n)) and numer(cs(n)) = A162446(n).
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CROSSREFS
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See A162446 for the numerators of the column sums.
Sequence in context: A002196 A141421 A000909 this_sequence A061025 A042749 A089036
Adjacent sequences: A162444 A162445 A162446 this_sequence A162448 A162449 A162450
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KEYWORD
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easy,frac,nonn
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AUTHOR
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Johannes W. Meijer (meijgia(AT)hotmail.com), Jul 06 2009
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