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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 | 10 |
| 4 | 40 |
| 5 | 152 |
| 6 | 663 |
| 7 | 2764 |
| 8 | 12535 |
| 9 | 54868 |
| 10 | 254618 |
| 11 | 1149816 |
| 12 | 5416066 |
| 13 | 24963487 |
| 14 | 118813118 |
| 15 | 555574475 |
| 16 | 2664192114 |
| 17 | 12590183411 |
| 18 | 60716475411 |
| 19 | 289237761617 |
| 20 | 1400959354137 |
| 21 | 6715638325853 |
| 22 | 32640829654516 |
| 23 | 157247695092057 |
| 24 | 766435077201282 |
| 25 | 3707253492778648 |
| 26 | 18111174831201882 |
| 27 | 87896052331507647 |
[1,1,3,10,40,152,663,2764,12535,54868,254618, 1149816,5416066,24963487,118813118,555574475, 2664192114,12590183411,60716475411,289237761617, 1400959354137,6715638325853,32640829654516, 157247695092057,766435077201282,3707253492778648, 18111174831201882,87896052331507647] |