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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 | 2 |
| 3 | 4 |
| 4 | 13 |
| 5 | 46 |
| 6 | 184 |
| 7 | 805 |
| 8 | 3840 |
| 9 | 19775 |
| 10 | 109180 |
| 11 | 642382 |
| 12 | 4007712 |
| 13 | 26399764 |
| 14 | 182939900 |
| 15 | 1329327991 |
| 16 | 10100670183 |
| 17 | 80053631844 |
| 18 | 660328296777 |
| 19 | 5657449573120 |
| 20 | 50255253534312 |
| 21 | 462096537041953 |
| 22 | 4391648990609487 |
| 23 | 43079839534282880 |
[1,1,2,4,13,46,184,805,3840,19775,109180,642382, 4007712,26399764,182939900,1329327991,10100670183, 80053631844,660328296777,5657449573120, 50255253534312,462096537041953,4391648990609487, 43079839534282880] |