The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 16 |
| 4 | 53 |
| 5 | 130 |
| 6 | 431 |
| 7 | 1104 |
| 8 | 3689 |
| 9 | 9730 |
| 10 | 32775 |
| 11 | 88288 |
| 12 | 299501 |
[1,2,7,16,53,130,431,1104,3689,9730,32775,88288, 299501] |