The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 5 |
| 5 | 35 |
| 6 | 385 |
| 7 | 715 |
| 8 | 12155 |
| 9 | 46189 |
| 10 | 1062347 |
| 11 | 30808063 |
| 12 | 955049953 |
| 13 | 1859834119 |
| 14 | 76253198879 |
| 15 | 298080686527 |
| 16 | 14009792266769 |
| 17 | 742518990138757 |
| 18 | 43808620418186663 |
| 19 | 86204059532560853 |
| 20 | 339745411098916303 |
| 21 | 24121924188023057513 |
| 22 | 47591904479072518877 |
| 23 | 3759760453846728991283 |
[1,2,1,5,35,385,715,12155,46189,1062347,30808063, 955049953,1859834119,76253198879,298080686527, 14009792266769,742518990138757,43808620418186663, 86204059532560853,339745411098916303, 24121924188023057513,47591904479072518877, 3759760453846728991283] |