The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 3 |
| 5 | 3 |
| 6 | 7 |
| 7 | 12 |
| 8 | 49 |
| 9 | 340 |
| 10 | 6153 |
| 11 | 362275 |
| 12 | 234314697 |
| 13 | 4303312007019 |
| 14 | 8064823505928103487 |
| 15 | 21034270897045389505182033301 |
| 16 | 13184627067084215135862894820778146400791573 |
| 17 | 36011454158212923548860166370685543204871921069986403871775848271 |
| 18 | 6820216143160044256325325882329406136711110111012515344838677137010956148075846307036940303634819 |
[2,2,2,3,3,7,12,49,340,6153,362275,234314697, 4303312007019,8064823505928103487, 21034270897045389505182033301, 13184627067084215135862894820778146400791573, 36011454158212923548860166370685543204871921069986\ 403871775848271, 68202161431600442563253258823294061367111101110125\ 15344838677137010956148075846307036940303634819] |