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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 | 3 |
| 3 | 6 |
| 4 | 18 |
| 5 | 50 |
| 6 | 153 |
| 7 | 504 |
| 8 | 1638 |
| 9 | 5769 |
| 10 | 20068 |
| 11 | 72751 |
| 12 | 266169 |
| 13 | 988016 |
| 14 | 3730735 |
| 15 | 14171839 |
| 16 | 54628042 |
| 17 | 211739875 |
| 18 | 828935479 |
| 19 | 3265817469 |
| 20 | 12950492111 |
| 21 | 51683663416 |
| 22 | 207238224437 |
| 23 | 835593504655 |
| 24 | 3382925340979 |
| 25 | 13756348538770 |
| 26 | 56151660690996 |
| 27 | 230010511496891 |
| 28 | 945408155934520 |
| 29 | 3897506695343284 |
[1,1,3,6,18,50,153,504,1638,5769,20068,72751, 266169,988016,3730735,14171839,54628042,211739875, 828935479,3265817469,12950492111,51683663416, 207238224437,835593504655,3382925340979, 13756348538770,56151660690996,230010511496891, 945408155934520,3897506695343284] |