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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 32 |
| 2 | 462 |
| 3 | 4224 |
| 4 | 28314 |
| 5 | 151008 |
| 6 | 674817 |
| 7 | 2617472 |
| 8 | 9038458 |
| 9 | 28316288 |
| 10 | 81662152 |
| 11 | 219288576 |
| 12 | 553361016 |
| 13 | 1322057088 |
| 14 | 3009057018 |
| 15 | 6558440064 |
| 16 | 13748813155 |
| 17 | 27825992480 |
| 18 | 54545269350 |
| 19 | 103848201600 |
| 20 | 192502703250 |
| 21 | 348178802400 |
| 22 | 615628210275 |
| 23 | 1065899278080 |
| 24 | 1809869155380 |
[1,32,462,4224,28314,151008,674817,2617472, 9038458,28316288,81662152,219288576,553361016, 1322057088,3009057018,6558440064,13748813155, 27825992480,54545269350,103848201600,192502703250, 348178802400,615628210275,1065899278080, 1809869155380] |