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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 46 |
| 4 | 295 |
| 5 | 1868 |
| 6 | 11746 |
| 7 | 73566 |
| 8 | 459701 |
| 9 | 2868839 |
| 10 | 17890042 |
| 11 | 111514170 |
| 12 | 694931568 |
| 13 | 4330050997 |
| 14 | 26977960626 |
| 15 | 168075845641 |
| 16 | 1047104723691 |
| 17 | 6523316303432 |
| 18 | 40639003178173 |
| 19 | 253171922034855 |
| 20 | 1577200193353582 |
| 21 | 9825562314051139 |
| 22 | 61210737601514136 |
| 23 | 381327026058717406 |
[1,1,7,46,295,1868,11746,73566,459701,2868839, 17890042,111514170,694931568,4330050997, 26977960626,168075845641,1047104723691, 6523316303432,40639003178173,253171922034855, 1577200193353582,9825562314051139, 61210737601514136,381327026058717406] |