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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 71 |
| 4 | 401 |
| 5 | 2923 |
| 6 | 19567 |
| 7 | 134507 |
| 8 | 919377 |
| 9 | 6283897 |
| 10 | 42987489 |
| 11 | 293903925 |
| 12 | 2009922151 |
| 13 | 13744157339 |
| 14 | 93985887721 |
| 15 | 642701573055 |
| 16 | 4394944856905 |
| 17 | 30053778082923 |
| 18 | 205515234410701 |
| 19 | 1405365233289259 |
| 20 | 9610242269541951 |
[1,7,71,401,2923,19567,134507,919377,6283897, 42987489,293903925,2009922151,13744157339, 93985887721,642701573055,4394944856905, 30053778082923,205515234410701,1405365233289259, 9610242269541951] |