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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 200 |
| 2 | 405000 |
| 3 | 34009632 |
| 4 | 828786600 |
| 5 | 10057575600 |
| 6 | 78117080400 |
| 7 | 444684760200 |
| 8 | 2013684539760 |
| 9 | 7650742653000 |
| 10 | 25296927545000 |
| 11 | 74726358240600 |
| 12 | 201078440944200 |
[0,200,405000,34009632,828786600,10057575600, 78117080400,444684760200,2013684539760, 7650742653000,25296927545000,74726358240600, 201078440944200] |