The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 32 |
| 6 | 232 |
| 7 | 992 |
| 8 | 10096 |
| 9 | 53408 |
| 10 | 727360 |
| 11 | 4569536 |
| 12 | 79501696 |
| 13 | 578101376 |
| 14 | 12337163008 |
| 15 | 101945840384 |
| 16 | 2582987522560 |
| 17 | 23913303638528 |
| 18 | 701604503968768 |
| 19 | 7194776722623488 |
| 20 | 239847438803052544 |
| 21 | 2698941227297687552 |
| 22 | 100744097104231198720 |
| 23 | 1234263151585971974144 |
| 24 | 50993324690816940089344 |
[0,0,1,2,10,32,232,992,10096,53408,727360,4569536, 79501696,578101376,12337163008,101945840384, 2582987522560,23913303638528,701604503968768, 7194776722623488,239847438803052544, 2698941227297687552,100744097104231198720, 1234263151585971974144,50993324690816940089344] |