The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 4 |
| 7 | 7 |
| 8 | 11 |
| 9 | 17 |
| 10 | 24 |
| 11 | 35 |
| 12 | 48 |
| 13 | 63 |
| 14 | 87 |
| 15 | 111 |
| 16 | 154 |
| 17 | 192 |
| 18 | 242 |
| 19 | 313 |
| 20 | 395 |
| 21 | 493 |
[0,0,0,1,2,4,7,11,17,24,35,48,63,87,111,154,192, 242,313,395,493] |