The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 6 |
| 4 | 45 |
| 5 | 54 |
| 6 | 365 |
| 7 | 438 |
| 8 | 2925 |
| 9 | 3510 |
| 10 | 23405 |
| 11 | 28086 |
| 12 | 187245 |
| 13 | 224694 |
| 14 | 1497965 |
| 15 | 1797558 |
| 16 | 11983725 |
| 17 | 14380470 |
| 18 | 95869805 |
| 19 | 115043766 |
| 20 | 766958445 |
| 21 | 920350134 |
| 22 | 6135667565 |
| 23 | 7362801078 |
| 24 | 49085340525 |
| 25 | 58902408630 |
| 26 | 392682724205 |
| 27 | 471219269046 |
[0,5,6,45,54,365,438,2925,3510,23405,28086,187245, 224694,1497965,1797558,11983725,14380470,95869805, 115043766,766958445,920350134,6135667565, 7362801078,49085340525,58902408630,392682724205, 471219269046] |