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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 135 |
| 3 | 2100 |
| 4 | 35475 |
| 5 | 632502 |
| 6 | 11714745 |
| 7 | 223198440 |
| 8 | 4346520750 |
| 9 | 86128357150 |
| 10 | 1731030945644 |
| 11 | 35202562937100 |
| 12 | 723029038312230 |
| 13 | 14976976398326250 |
| 14 | 312522428615310000 |
| 15 | 6563314391270476752 |
| 16 | 138617681440915119975 |
| 17 | 2942332729799060033100 |
| 18 | 62735156704285184848950 |
[1,10,135,2100,35475,632502,11714745,223198440, 4346520750,86128357150,1731030945644, 35202562937100,723029038312230,14976976398326250, 312522428615310000,6563314391270476752, 138617681440915119975,2942332729799060033100, 62735156704285184848950] |