The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 34 |
| 5 | 480 |
| 6 | 17180 |
| 7 | 1652171 |
| 8 | 461346215 |
| 9 | 396507897335 |
| 10 | 1093817527528804 |
| 11 | 9967640563717565125 |
| 12 | 306039783996035518230753 |
| 13 | 32112037153481933712774822566 |
| 14 | 11641561173234351448063113301394401 |
[0,1,2,5,34,480,17180,1652171,461346215, 396507897335,1093817527528804,9967640563717565125, 306039783996035518230753, 32112037153481933712774822566, 11641561173234351448063113301394401] |