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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 48 |
| 3 | 305 |
| 4 | 1800 |
| 5 | 10933 |
| 6 | 65856 |
| 7 | 397970 |
| 8 | 2402455 |
| 9 | 14508869 |
| 10 | 87609600 |
| 11 | 529045373 |
| 12 | 3194668217 |
| 13 | 19291314050 |
| 14 | 116492151552 |
| 15 | 703447966957 |
| 16 | 4247829912600 |
| 17 | 25650883291001 |
| 18 | 154895038005840 |
| 19 | 935346867163930 |
| 20 | 5648171599648271 |
[10,48,305,1800,10933,65856,397970,2402455, 14508869,87609600,529045373,3194668217, 19291314050,116492151552,703447966957, 4247829912600,25650883291001,154895038005840, 935346867163930,5648171599648271] |