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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 | 21 |
| 3 | 163 |
| 4 | 1353 |
| 5 | 11760 |
| 6 | 105681 |
| 7 | 973953 |
| 8 | 9154821 |
| 9 | 87428388 |
| 10 | 845894700 |
| 11 | 8273978100 |
| 12 | 81682757317 |
| 13 | 812829371205 |
| 14 | 8144563709391 |
| 15 | 82104333340467 |
| 16 | 832125695906313 |
| 17 | 8473862660311392 |
| 18 | 86661931504395228 |
| 19 | 889705959333345756 |
[1,3,21,163,1353,11760,105681,973953,9154821, 87428388,845894700,8273978100,81682757317, 812829371205,8144563709391,82104333340467, 832125695906313,8473862660311392, 86661931504395228,889705959333345756] |