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Search: id:A098607
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| A098607 |
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Sum of all matrix elements M(i,j) = (i*j)/(i+j) multiplied by (2*n)!/n!. |
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+0
1
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| 0, 1, 34, 988, 30120, 1002360, 36667344, 1471350720, 64457424000, 3066397905600, 157584858076800, 8706059034140160, 514786845983155200, 32448410132597222400, 2172454153870807296000, 153986353780968511488000
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OFFSET
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0,3
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FORMULA
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a(n) = (2*n)!/n!*Sum[Sum[(i*j)/(i+j), {i, 1, n}], {j, 1, n}]
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MATHEMATICA
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Table[(2*n)!/n!*Sum[Sum[(i*j)/(i+j), {i, 1, n}], {j, 1, n}], {n, 0, 15}]
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CROSSREFS
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Sequence in context: A063843 A020535 A134500 this_sequence A075292 A158696 A029547
Adjacent sequences: A098604 A098605 A098606 this_sequence A098608 A098609 A098610
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 26 2004
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