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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
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0, 1, 76, 7032, 889920, 151876800, 33953713920, 9671337446400, 3426840152064000, 1480226878835712000, 766252171508060160000, 468506511112577236992000, 334155981137427201392640000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| a(n) = (2*n)!*Sum[Sum[(i^2)/(i+j), {i, 1, n}], {j, 1, n}]
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MATHEMATICA
| Table[(2*n)!*Sum[Sum[(i^2)/(i+j), {i, 1, n}], {j, 1, n}], {n, 0, 15}]
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CROSSREFS
| Sequence in context: A049669 A198476 A139671 * A093276 A184290 A093238
Adjacent sequences: A098603 A098604 A098605 * A098607 A098608 A098609
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KEYWORD
| nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 26 2004
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