The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 83 |
| 4 | 664 |
| 5 | 5313 |
| 6 | 42506 |
| 7 | 340051 |
| 8 | 2720408 |
| 9 | 21763265 |
| 10 | 174106122 |
| 11 | 1392848979 |
| 12 | 11142791832 |
| 13 | 89142334657 |
| 14 | 713138677258 |
| 15 | 5705109418067 |
| 16 | 45640875344536 |
| 17 | 365127002756289 |
| 18 | 2921016022050314 |
[1,10,83,664,5313,42506,340051,2720408,21763265, 174106122,1392848979,11142791832,89142334657, 713138677258,5705109418067,45640875344536, 365127002756289,2921016022050314] |