The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 3 |
| 9 | 15 |
| 10 | 21 |
| 11 | 45 |
| 12 | 77 |
| 13 | 273 |
| 14 | 569 |
| 15 | 2606 |
| 16 | 6661 |
| 17 | 31883 |
| 18 | 89951 |
| 19 | 535540 |
| 20 | 1839325 |
| 21 | 13532589 |
| 22 | 55467031 |
| 23 | 467306429 |
| 24 | 2229430591 |
| 25 | 22257836225 |
[1,1,1,1,1,1,1,3,15,21,45,77,273,569,2606,6661, 31883,89951,535540,1839325,13532589,55467031, 467306429,2229430591,22257836225] |