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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 24 |
| 4 | 104 |
| 5 | 448 |
| 6 | 1888 |
| 7 | 7808 |
| 8 | 31872 |
| 9 | 129024 |
| 10 | 519680 |
| 11 | 2086912 |
| 12 | 8366080 |
| 13 | 33505280 |
| 14 | 134111232 |
| 15 | 536641536 |
| 16 | 2146992128 |
| 17 | 8588886016 |
| 18 | 34357510144 |
| 19 | 137434234880 |
| 20 | 549745852416 |
| 21 | 2199002284032 |
| 22 | 8796048982016 |
| 23 | 35184279814144 |
| 24 | 140737295417344 |
| 25 | 562949550768128 |
| 26 | 2251798974824448 |
[1,2,6,24,104,448,1888,7808,31872,129024,519680, 2086912,8366080,33505280,134111232,536641536, 2146992128,8588886016,34357510144,137434234880, 549745852416,2199002284032,8796048982016, 35184279814144,140737295417344,562949550768128, 2251798974824448] |