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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 2 |
| 7 | 1 |
| 8 | 9 |
| 9 | 7 |
| 10 | 40 |
| 11 | 63 |
| 12 | 401 |
| 13 | 1202 |
| 14 | 6503 |
| 15 | 31505 |
| 16 | 187643 |
| 17 | 1137602 |
| 18 | 7617639 |
| 19 | 53688610 |
[0,0,0,1,0,2,1,9,7,40,63,401,1202,6503,31505, 187643,1137602,7617639,53688610] |