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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 30 |
| 3 | 554 |
| 4 | 8088 |
| 5 | 114318 |
| 6 | 1676740 |
| 7 | 24773296 |
| 8 | 370085158 |
| 9 | 5573917456 |
| 10 | 84505086146 |
| 11 | 1288142241806 |
| 12 | 19723300256104 |
| 13 | 303110117057606 |
| 14 | 4672886017374940 |
| 15 | 72233860901133456 |
| 16 | 1119204087096130496 |
| 17 | 17376470515536487116 |
[0,30,554,8088,114318,1676740,24773296,370085158, 5573917456,84505086146,1288142241806, 19723300256104,303110117057606,4672886017374940, 72233860901133456,1119204087096130496, 17376470515536487116] |