The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 58 |
| 5 | 746 |
| 6 | 11786 |
| 7 | 219076 |
| 8 | 4664939 |
| 9 | 111755188 |
| 10 | 2972722571 |
| 11 | 86921839164 |
| 12 | 2771315128064 |
| 13 | 95702436112958 |
| 14 | 3559390186217691 |
| 15 | 141876840484813540 |
| 16 | 6034767098100363938 |
| 17 | 272876063329174663702 |
| 18 | 13072133069784764308105 |
| 19 | 661414882620924186276282 |
| 20 | 35249032476818384801858422 |
| 21 | 1973681124359292990559785042 |
| 22 | 115843427877914768308868529869 |
[1,1,6,58,746,11786,219076,4664939,111755188, 2972722571,86921839164,2771315128064, 95702436112958,3559390186217691, 141876840484813540,6034767098100363938, 272876063329174663702,13072133069784764308105, 661414882620924186276282, 35249032476818384801858422, 1973681124359292990559785042, 115843427877914768308868529869] |