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Search: id:A098606
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| A098606 |
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Sum of all matrix elements M(i,j) = (i^2)/(i+j). |
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+0
1
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| 0, 1, 76, 7032, 889920, 151876800, 33953713920, 9671337446400, 3426840152064000, 1480226878835712000, 766252171508060160000, 468506511112577236992000, 334155981137427201392640000
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OFFSET
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0,3
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FORMULA
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a(n) = (2*n)!*Sum[Sum[(i^2)/(i+j), {i, 1, n}], {j, 1, n}]
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MATHEMATICA
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Table[(2*n)!*Sum[Sum[(i^2)/(i+j), {i, 1, n}], {j, 1, n}], {n, 0, 15}]
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CROSSREFS
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Sequence in context: A004299 A049669 A139671 this_sequence A093276 A093238 A028480
Adjacent sequences: A098603 A098604 A098605 this_sequence A098607 A098608 A098609
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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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