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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 32 |
| 3 | 338 |
| 4 | 3200 |
| 5 | 29282 |
| 6 | 264992 |
| 7 | 2389298 |
| 8 | 21516800 |
| 9 | 193690562 |
| 10 | 1743333152 |
| 11 | 15690352658 |
| 12 | 141214236800 |
| 13 | 1270931319842 |
| 14 | 11438391444512 |
| 15 | 102945551698418 |
| 16 | 926510051379200 |
| 17 | 8338590720693122 |
| 18 | 75047317261079072 |
| 19 | 675425857674234578 |
| 20 | 6078832726041680000 |
| 21 | 54709494555295826402 |
[2,32,338,3200,29282,264992,2389298,21516800, 193690562,1743333152,15690352658,141214236800, 1270931319842,11438391444512,102945551698418, 926510051379200,8338590720693122, 75047317261079072,675425857674234578, 6078832726041680000,54709494555295826402] |