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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 48 |
| 4 | 288 |
| 5 | 1536 |
| 6 | 7680 |
| 7 | 36864 |
| 8 | 172032 |
| 9 | 786432 |
| 10 | 3538944 |
| 11 | 15728640 |
| 12 | 69206016 |
| 13 | 301989888 |
| 14 | 1308622848 |
| 15 | 5637144576 |
| 16 | 24159191040 |
| 17 | 103079215104 |
| 18 | 438086664192 |
| 19 | 1855425871872 |
| 20 | 7834020347904 |
| 21 | 32985348833280 |
| 22 | 138538465099776 |
[0,6,48,288,1536,7680,36864,172032,786432,3538944, 15728640,69206016,301989888,1308622848,5637144576, 24159191040,103079215104,438086664192, 1855425871872,7834020347904,32985348833280, 138538465099776] |