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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 40 |
| 3 | 875 |
| 4 | 24696 |
| 5 | 814968 |
| 6 | 29899584 |
| 7 | 1184303835 |
| 8 | 49711519000 |
| 9 | 2183727606632 |
| 10 | 99503164453056 |
| 11 | 4672502764108088 |
| 12 | 225011739846443200 |
| 13 | 11070183993903000000 |
| 14 | 554749060302467136000 |
| 15 | 28247778810831290434875 |
| 16 | 1458696209123375067879000 |
| 17 | 76266400563425844598365000 |
[1,3,40,875,24696,814968,29899584,1184303835, 49711519000,2183727606632,99503164453056, 4672502764108088,225011739846443200, 11070183993903000000,554749060302467136000, 28247778810831290434875,1458696209123375067879000, 76266400563425844598365000] |