The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 196 |
| 4 | 2765 |
| 5 | 38731 |
| 6 | 545328 |
| 7 | 7675381 |
| 8 | 108065699 |
| 9 | 1521488668 |
| 10 | 21421955457 |
| 11 | 301612441375 |
| 12 | 4246586949080 |
| 13 | 59790307544569 |
| 14 | 841824567122343 |
| 15 | 11852566615920436 |
| 16 | 166879587240301061 |
| 17 | 2349600516714827299 |
[1,15,196,2765,38731,545328,7675381,108065699, 1521488668,21421955457,301612441375,4246586949080, 59790307544569,841824567122343,11852566615920436, 166879587240301061,2349600516714827299] |