|
| |
|
|
A098607
|
|
Sum of all matrix elements M(i,j) = (i*j)/(i+j) multiplied by (2*n)!/n!.
|
|
0
| |
|
|
0, 1, 34, 988, 30120, 1002360, 36667344, 1471350720, 64457424000, 3066397905600, 157584858076800, 8706059034140160, 514786845983155200, 32448410132597222400, 2172454153870807296000, 153986353780968511488000
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
FORMULA
| a(n) = (2*n)!/n!*Sum[Sum[(i*j)/(i+j), {i, 1, n}], {j, 1, n}]
|
|
|
MATHEMATICA
| Table[(2*n)!/n!*Sum[Sum[(i*j)/(i+j), {i, 1, n}], {j, 1, n}], {n, 0, 15}]
|
|
|
CROSSREFS
| Sequence in context: A192094 A020535 A134500 * A075292 A162838 A163217
Adjacent sequences: A098604 A098605 A098606 * A098608 A098609 A098610
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 26 2004
|
| |
|
|
