The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 612 |
| 3 | 203042 |
| 4 | 567290110 |
| 5 | 132156182210240 |
| 6 | 272306342380420462 |
| 7 | 506552600650702756812 |
| 8 | 87093099210561122119012601332 |
| 9 | 140614821560164017221806189219802070 |
[2,612,203042,567290110,132156182210240, 272306342380420462,506552600650702756812, 87093099210561122119012601332, 140614821560164017221806189219802070] |