The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 21 |
| 4 | 147 |
| 5 | 1029 |
| 6 | 103929 |
| 7 | 311787 |
| 8 | 311787 |
| 9 | 311787 |
| 10 | 4053231 |
| 11 | 28372617 |
| 12 | 1447003467 |
| 13 | 44857107477 |
| 14 | 134571322431 |
| 15 | 39967682762007 |
| 16 | 5155831076298903 |
| 17 | 3542055949417346361 |
| 18 | 456925217474837680569 |
| 19 | 216125627865598222909137 |
[1,1,3,21,147,1029,103929,311787,311787,311787, 4053231,28372617,1447003467,44857107477, 134571322431,39967682762007,5155831076298903, 3542055949417346361,456925217474837680569, 216125627865598222909137] |