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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1104 |
| 2 | 170064 |
| 3 | 8662720 |
| 4 | 195082320 |
| 5 | 2319457632 |
| 6 | 17231109824 |
| 7 | 93703589760 |
| 8 | 407488018512 |
| 9 | 1487286966928 |
| 10 | 4744779429216 |
| 11 | 13523760003648 |
| 12 | 35250721087168 |
| 13 | 84944161233120 |
| 14 | 192127452262272 |
| 15 | 409984511707776 |
| 16 | 834658207381584 |
| 17 | 1624411151609760 |
| 18 | 3049176879087248 |
| 19 | 5521413521657280 |
[1,1104,170064,8662720,195082320,2319457632, 17231109824,93703589760,407488018512, 1487286966928,4744779429216,13523760003648, 35250721087168,84944161233120,192127452262272, 409984511707776,834658207381584,1624411151609760, 3049176879087248,5521413521657280] |