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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 15 |
| 4 | 21 |
| 5 | 210 |
| 6 | 62481 |
| 7 | 67896 |
| 8 | 557040 |
| 9 | 2618616 |
| 10 | 10095771 |
| 11 | 10550121 |
| 12 | 28883800 |
| 13 | 62490610 |
| 14 | 1524872700 |
| 15 | 2708516800 |
| 16 | 5491258003 |
| 17 | 103352174628 |
| 18 | 299536839001 |
| 19 | 24709216250400 |
| 20 | 7220385308804403 |
| 21 | 7686108558349885 |
| 22 | 10917127849295955 |
| 23 | 15038347789610970 |
| 24 | 23424201805125660 |
[1,10,15,21,210,62481,67896,557040,2618616, 10095771,10550121,28883800,62490610,1524872700, 2708516800,5491258003,103352174628,299536839001, 24709216250400,7220385308804403,7686108558349885, 10917127849295955,15038347789610970, 23424201805125660] |