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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 10 |
| 4 | 35 |
| 5 | 462 |
| 6 | 1716 |
| 7 | 24310 |
| 8 | 92378 |
| 9 | 1352078 |
| 10 | 77558760 |
| 11 | 300540195 |
| 12 | 17672631900 |
| 13 | 269128937220 |
| 14 | 1052049481860 |
| 15 | 16123801841550 |
| 16 | 973469712824056 |
| 17 | 59132290782430712 |
| 18 | 232714176627630544 |
| 19 | 14226520737620288370 |
| 20 | 221256270138418389602 |
| 21 | 873065282167813104916 |
| 22 | 53753604366668088230810 |
[2,3,10,35,462,1716,24310,92378,1352078,77558760, 300540195,17672631900,269128937220,1052049481860, 16123801841550,973469712824056,59132290782430712, 232714176627630544,14226520737620288370, 221256270138418389602,873065282167813104916, 53753604366668088230810] |