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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 22 |
| 3 | 152 |
| 4 | 1462 |
| 5 | 13772 |
| 6 | 139144 |
| 7 | 1431824 |
| 8 | 15086614 |
| 9 | 161254844 |
| 10 | 1745205892 |
| 11 | 19070813984 |
| 12 | 210091931944 |
| 13 | 2330150737904 |
| 14 | 25993622086384 |
| 15 | 291414635747552 |
| 16 | 3281265369826774 |
| 17 | 37087677409301804 |
| 18 | 420618333874721044 |
[2,22,152,1462,13772,139144,1431824,15086614, 161254844,1745205892,19070813984,210091931944, 2330150737904,25993622086384,291414635747552, 3281265369826774,37087677409301804, 420618333874721044] |