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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 18 |
| 3 | 126 |
| 4 | 945 |
| 5 | 7371 |
| 6 | 58968 |
| 7 | 480168 |
| 8 | 3961386 |
| 9 | 33011550 |
| 10 | 277297020 |
| 11 | 2344420260 |
| 12 | 19927572210 |
| 13 | 170150808870 |
| 14 | 1458435504600 |
| 15 | 12542545339560 |
| 16 | 108179453553705 |
| 17 | 935434098376155 |
| 18 | 8107095519260010 |
| 19 | 70403724246205350 |
| 20 | 612512400941986545 |
| 21 | 5337608065351597035 |
| 22 | 46582761297613937760 |
[1,3,18,126,945,7371,58968,480168,3961386, 33011550,277297020,2344420260,19927572210, 170150808870,1458435504600,12542545339560, 108179453553705,935434098376155,8107095519260010, 70403724246205350,612512400941986545, 5337608065351597035,46582761297613937760] |