The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 46 |
| 4 | 361 |
| 5 | 3436 |
| 6 | 37729 |
| 7 | 463366 |
| 8 | 6280369 |
| 9 | 93015352 |
| 10 | 1491337441 |
| 11 | 25684077706 |
| 12 | 472217487625 |
| 13 | 9221588527204 |
| 14 | 190441412508481 |
| 15 | 4143470377262806 |
| 16 | 94663498086222049 |
| 17 | 2264440394856702832 |
| 18 | 56570146384760433217 |
| 19 | 1472545685988162638722 |
[1,1,7,46,361,3436,37729,463366,6280369,93015352, 1491337441,25684077706,472217487625,9221588527204, 190441412508481,4143470377262806, 94663498086222049,2264440394856702832, 56570146384760433217,1472545685988162638722] |