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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 25 |
| 6 | 75 |
| 7 | 222 |
| 8 | 696 |
| 9 | 2203 |
| 10 | 7371 |
| 11 | 24787 |
| 12 | 86008 |
| 13 | 301117 |
| 14 | 1077079 |
| 15 | 3884641 |
| 16 | 14241326 |
| 17 | 52666805 |
| 18 | 196980204 |
| 19 | 742074660 |
| 20 | 2821601164 |
| 21 | 10806383704 |
| 22 | 41688390675 |
| 23 | 161765527299 |
| 24 | 631511352222 |
| 25 | 2479059137090 |
| 26 | 9782815644799 |
| 27 | 38784291290400 |
| 28 | 154442952504946 |
| 29 | 617627277390419 |
| 30 | 2479845218105827 |
[1,1,2,4,10,25,75,222,696,2203,7371,24787,86008, 301117,1077079,3884641,14241326,52666805, 196980204,742074660,2821601164,10806383704, 41688390675,161765527299,631511352222, 2479059137090,9782815644799,38784291290400, 154442952504946,617627277390419,2479845218105827] |