The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 47 |
| 4 | 540 |
| 5 | 8429 |
| 6 | 166210 |
| 7 | 3952955 |
| 8 | 109981816 |
| 9 | 3502905369 |
| 10 | 125648153278 |
| 11 | 5011458069639 |
| 12 | 219987094389524 |
| 13 | 10538817637744005 |
| 14 | 547118005892177018 |
| 15 | 30595552548140425747 |
| 16 | 1833501625083035349488 |
| 17 | 117219490267316310468913 |
[0,1,6,47,540,8429,166210,3952955,109981816, 3502905369,125648153278,5011458069639, 219987094389524,10538817637744005, 547118005892177018,30595552548140425747, 1833501625083035349488,117219490267316310468913] |