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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 35 |
| 3 | 252 |
| 4 | 1716 |
| 5 | 12870 |
| 6 | 92378 |
| 7 | 705432 |
| 8 | 5200300 |
| 9 | 40116600 |
| 10 | 300540195 |
| 11 | 2333606220 |
| 12 | 17672631900 |
| 13 | 137846528820 |
| 14 | 1052049481860 |
| 15 | 8233430727600 |
| 16 | 63205303218876 |
| 17 | 495918532948104 |
| 18 | 3824345300380220 |
| 19 | 30067266499541040 |
| 20 | 232714176627630544 |
| 21 | 1832624140942590534 |
| 22 | 14226520737620288370 |
| 23 | 112186277816662845432 |
| 24 | 873065282167813104916 |
[1,6,35,252,1716,12870,92378,705432,5200300, 40116600,300540195,2333606220,17672631900, 137846528820,1052049481860,8233430727600, 63205303218876,495918532948104,3824345300380220, 30067266499541040,232714176627630544, 1832624140942590534,14226520737620288370, 112186277816662845432,873065282167813104916] |