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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7128 |
| 3 | 67104 |
| 4 | 1114848 |
| 5 | 14710368 |
| 6 | 208867428 |
| 7 | 2783857776 |
| 8 | 37310632920 |
| 9 | 488972134752 |
| 10 | 6374741325108 |
| 11 | 82212554730696 |
| 12 | 1054083281172600 |
| 13 | 13425573904100400 |
| 14 | 170167484580493980 |
| 15 | 2146806101503300608 |
[0,7128,67104,1114848,14710368,208867428, 2783857776,37310632920,488972134752,6374741325108, 82212554730696,1054083281172600,13425573904100400, 170167484580493980,2146806101503300608] |