The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 56 |
| 4 | 2050 |
| 5 | 318752 |
| 6 | 252035714 |
| 7 | 980755711616 |
| 8 | 23647746367946754 |
| 9 | 3088949241542073508352 |
| 10 | 2940240000900000020000000002 |
| 11 | 16218429504693724464229916894517248 |
| 12 | 748528620411995327278028288988088683724802 |
| 13 | 210422023062476527874650307058798916093350502080512 |
[1,2,6,56,2050,318752,252035714,980755711616, 23647746367946754,3088949241542073508352, 2940240000900000020000000002, 16218429504693724464229916894517248, 748528620411995327278028288988088683724802, 21042202306247652787465030705879891609335050208051\ 2] |