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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 340 |
| 3 | 5846 |
| 4 | 71372 |
| 5 | 706068 |
| 6 | 6052840 |
| 7 | 46759630 |
| 8 | 333746556 |
| 9 | 2238411692 |
| 10 | 14277544216 |
| 11 | 87376309020 |
| 12 | 516495616120 |
| 13 | 2964332933800 |
| 14 | 16586670357200 |
| 15 | 90782049175614 |
| 16 | 487329793111260 |
| 17 | 2571575908919740 |
| 18 | 13364166071956280 |
| 19 | 68507393061864020 |
| 20 | 346874109053120616 |
[10,340,5846,71372,706068,6052840,46759630, 333746556,2238411692,14277544216,87376309020, 516495616120,2964332933800,16586670357200, 90782049175614,487329793111260,2571575908919740, 13364166071956280,68507393061864020, 346874109053120616] |