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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 17 |
| 5 | 50 |
| 6 | 171 |
| 7 | 567 |
| 8 | 1986 |
| 9 | 7141 |
| 10 | 25885 |
| 11 | 96335 |
| 12 | 361948 |
| 13 | 1377016 |
| 14 | 5303325 |
| 15 | 20571802 |
| 16 | 80572919 |
| 17 | 317654987 |
| 18 | 1260703066 |
| 19 | 5033962911 |
| 20 | 20202671783 |
| 21 | 81492060501 |
| 22 | 330138308530 |
| 23 | 1342982590056 |
| 24 | 5483760216426 |
| 25 | 22469085384921 |
| 26 | 92364016812169 |
| 27 | 380813151198233 |
| 28 | 1574483590304631 |
| 29 | 6526707421820414 |
[1,1,2,6,17,50,171,567,1986,7141,25885,96335, 361948,1377016,5303325,20571802,80572919, 317654987,1260703066,5033962911,20202671783, 81492060501,330138308530,1342982590056, 5483760216426,22469085384921,92364016812169, 380813151198233,1574483590304631,6526707421820414] |