The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 8 |
| 2 | 99 |
| 3 | 1958 |
| 4 | 28322 |
| 5 | 228249 |
| 6 | 2827300 |
| 7 | 55922199 |
| 8 | 808904403 |
| 9 | 9781942334 |
| 10 | 52199939826 |
| 11 | 603633907222 |
| 12 | 11356596271444 |
| 13 | 11356596271444 |
| 14 | 1828607235824962 |
| 15 | 37264994707118563 |
| 16 | 651495710876207647 |
| 17 | 5974828584341646375 |
| 18 | 49226908181248336040 |
[0,8,99,1958,28322,228249,2827300,55922199, 808904403,9781942334,52199939826,603633907222, 11356596271444,11356596271444,1828607235824962, 37264994707118563,651495710876207647, 5974828584341646375,49226908181248336040] |