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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 35 |
| 4 | 210 |
| 5 | 1295 |
| 6 | 7735 |
| 7 | 46655 |
| 8 | 279720 |
| 9 | 1679580 |
| 10 | 10076395 |
| 11 | 60466175 |
| 12 | 362789070 |
| 13 | 2176782335 |
| 14 | 13060647355 |
| 15 | 78364162765 |
| 16 | 470184704640 |
| 17 | 2821109907455 |
| 18 | 16926657757380 |
| 19 | 101559956668415 |
| 20 | 609359729932590 |
| 21 | 3656158440016285 |
| 22 | 21936950579911675 |
| 23 | 131621703842267135 |
[1,5,35,210,1295,7735,46655,279720,1679580, 10076395,60466175,362789070,2176782335, 13060647355,78364162765,470184704640, 2821109907455,16926657757380,101559956668415, 609359729932590,3656158440016285, 21936950579911675,131621703842267135] |