The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 5 | 0 |
| 6 | 216 |
| 7 | 1818 |
| 8 | 10402 |
| 9 | 50879 |
| 10 | 234061 |
| 11 | 1076807 |
| 12 | 5090497 |
| 13 | 24239396 |
| 14 | 114890044 |
| 15 | 539033760 |
| 16 | 2502282836 |
| 17 | 11522663348 |
| 18 | 52848995167 |
| 19 | 241925339959 |
| 20 | 1106164932006 |
| 21 | 5052307570906 |
| 22 | 23047344846397 |
| 23 | 104994467312301 |
| 24 | 477733956914534 |
| 25 | 2171607914492408 |
| 26 | 9864023776496558 |
[0,216,1818,10402,50879,234061,1076807,5090497, 24239396,114890044,539033760,2502282836, 11522663348,52848995167,241925339959, 1106164932006,5052307570906,23047344846397, 104994467312301,477733956914534,2171607914492408, 9864023776496558] |