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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 7 |
| 2 | 100 |
| 3 | 1128 |
| 4 | 11552 |
| 5 | 112160 |
| 6 | 1052544 |
| 7 | 9646336 |
| 8 | 86877184 |
| 9 | 772010496 |
| 10 | 6787635200 |
| 11 | 59163619328 |
| 12 | 512002867200 |
| 13 | 4404129513472 |
| 14 | 37687664508928 |
| 15 | 321065313239040 |
| 16 | 2724508666953728 |
| 17 | 23040146455789568 |
| 18 | 194245982204461056 |
| 19 | 1633162428477865984 |
| 20 | 13697353473127874560 |
[0,7,100,1128,11552,112160,1052544,9646336, 86877184,772010496,6787635200,59163619328, 512002867200,4404129513472,37687664508928, 321065313239040,2724508666953728, 23040146455789568,194245982204461056, 1633162428477865984,13697353473127874560] |