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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 495 |
| 3 | 5950 |
| 4 | 58065 |
| 5 | 486606 |
| 6 | 3622850 |
| 7 | 24508320 |
| 8 | 153065370 |
| 9 | 893004950 |
| 10 | 4910926857 |
| 11 | 25638586740 |
| 12 | 127801113520 |
| 13 | 611122860870 |
| 14 | 2814360594975 |
| 15 | 12523572401730 |
| 16 | 54001382371560 |
| 17 | 226189483208580 |
[1,30,495,5950,58065,486606,3622850,24508320, 153065370,893004950,4910926857,25638586740, 127801113520,611122860870,2814360594975, 12523572401730,54001382371560,226189483208580] |