The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 60 |
| 4 | 803 |
| 5 | 13071 |
| 6 | 244917 |
| 7 | 5101603 |
| 8 | 115451307 |
| 9 | 2794682082 |
| 10 | 71579132742 |
| 11 | 1924722618873 |
| 12 | 54022011952266 |
| 13 | 1575777019075715 |
| 14 | 47606721776494443 |
| 15 | 1485688929610479498 |
| 16 | 47790055655273649449 |
| 17 | 1581727833458617151379 |
[1,1,6,60,803,13071,244917,5101603,115451307, 2794682082,71579132742,1924722618873, 54022011952266,1575777019075715,47606721776494443, 1485688929610479498,47790055655273649449, 1581727833458617151379] |