The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 924 |
| 4 | 93320 |
| 5 | 15609240 |
| 6 | 3903974592 |
| 7 | 1364509038592 |
| 8 | 635177480713344 |
| 9 | 379867490829555840 |
| 10 | 283825251434680651520 |
| 11 | 259092157573229145859584 |
| 12 | 283735986144895532781391872 |
| 13 | 367138254141051794797009309696 |
| 14 | 554136240038549806366753446051840 |
[1,18,924,93320,15609240,3903974592,1364509038592, 635177480713344,379867490829555840, 283825251434680651520,259092157573229145859584, 283735986144895532781391872, 367138254141051794797009309696, 554136240038549806366753446051840] |