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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 32 |
| 3 | 128 |
| 4 | 2080 |
| 5 | 18688 |
| 6 | 209440 |
| 7 | 2150784 |
| 8 | 22847008 |
| 9 | 239510016 |
| 10 | 2523778080 |
| 11 | 26540458624 |
| 12 | 279321664544 |
| 13 | 2938791541504 |
| 14 | 30923196075552 |
| 15 | 325371816285056 |
| 16 | 3423602175951392 |
| 17 | 36023310011880448 |
| 18 | 379040068394055712 |
[0,32,128,2080,18688,209440,2150784,22847008, 239510016,2523778080,26540458624,279321664544, 2938791541504,30923196075552,325371816285056, 3423602175951392,36023310011880448, 379040068394055712] |