The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 6 |
| 5 | 5 |
| 6 | 20 |
| 7 | 37 |
| 8 | 2 |
| 9 | 51 |
| 10 | 329 |
| 11 | 710 |
| 12 | 1601 |
| 13 | 118 |
| 14 | 8599 |
| 15 | 20514 |
| 16 | 49905 |
| 17 | 122963 |
| 18 | 307199 |
| 19 | 775529 |
| 20 | 988939 |
| 21 | 282591 |
| 22 | 6592078 |
| 23 | 131812 |
| 24 | 45164337 |
| 25 | 119237493 |
| 26 | 19774239 |
| 27 | 168670563 |
| 28 | 4514955632 |
| 29 | 4044075790 |
| 30 | 32717113805 |
| 31 | 22129966762 |
| 32 | 240235675303 |
[1,2,1,6,5,20,37,2,51,329,710,1601,118,8599,20514, 49905,122963,307199,775529,988939,282591,6592078, 131812,45164337,119237493,19774239,168670563, 4514955632,4044075790,32717113805,22129966762, 240235675303] |