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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 133 |
| 3 | 1044 |
| 4 | 5794 |
| 5 | 24720 |
| 6 | 86608 |
| 7 | 260720 |
| 8 | 693552 |
| 9 | 1666000 |
| 10 | 3675680 |
| 11 | 7549488 |
| 12 | 14591440 |
| 13 | 26770832 |
| 14 | 46955760 |
| 15 | 79197040 |
| 16 | 129067568 |
| 17 | 204062160 |
| 18 | 314062912 |
| 19 | 471875120 |
| 20 | 693838800 |
| 21 | 1000520848 |
| 22 | 1417492880 |
| 23 | 1976199792 |
| 24 | 2714924080 |
[1,8,133,1044,5794,24720,86608,260720,693552, 1666000,3675680,7549488,14591440,26770832, 46955760,79197040,129067568,204062160,314062912, 471875120,693838800,1000520848,1417492880, 1976199792,2714924080] |