The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 120 |
| 3 | 1027 |
| 4 | 9045 |
| 5 | 79855 |
| 6 | 700972 |
| 7 | 6171389 |
| 8 | 54282231 |
| 9 | 477606439 |
| 10 | 4201803890 |
| 11 | 36967769965 |
| 12 | 325237650675 |
| 13 | 2861429906335 |
| 14 | 25174648217769 |
| 15 | 221485132130347 |
| 16 | 1948612085315302 |
| 17 | 17143771056376892 |
| 18 | 150829836716963750 |
[13,120,1027,9045,79855,700972,6171389,54282231, 477606439,4201803890,36967769965,325237650675, 2861429906335,25174648217769,221485132130347, 1948612085315302,17143771056376892, 150829836716963750] |