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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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 13 |
| 6 | 64 |
| 7 | 406 |
| 8 | 2737 |
| 9 | 23044 |
| 10 | 200509 |
| 11 | 2078460 |
| 12 | 22323513 |
| 13 | 275402437 |
| 14 | 3501602483 |
| 15 | 50310672046 |
| 16 | 739235942264 |
| 17 | 12084285146335 |
| 18 | 202054808987101 |
| 19 | 3703410393626031 |
| 20 | 69269248667062892 |
| 21 | 1409725495837854024 |
| 22 | 29169764518508360709 |
| 23 | 651568557906956269430 |
[1,1,0,1,3,13,64,406,2737,23044,200509,2078460, 22323513,275402437,3501602483,50310672046, 739235942264,12084285146335,202054808987101, 3703410393626031,69269248667062892, 1409725495837854024,29169764518508360709, 651568557906956269430] |