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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 | 27 |
| 4 | 147 |
| 5 | 916 |
| 6 | 4938 |
| 7 | 27208 |
| 8 | 152236 |
| 9 | 848992 |
| 10 | 4746938 |
| 11 | 26555583 |
| 12 | 148468255 |
| 13 | 830063597 |
| 14 | 4640855585 |
| 15 | 25946470239 |
| 16 | 145065530889 |
| 17 | 811058197498 |
| 18 | 4534601269690 |
| 19 | 25352811924120 |
| 20 | 141746752099136 |
| 21 | 792501412285360 |
[1,7,27,147,916,4938,27208,152236,848992,4746938, 26555583,148468255,830063597,4640855585, 25946470239,145065530889,811058197498, 4534601269690,25352811924120,141746752099136, 792501412285360] |