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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 46 |
| 2 | 1080 |
| 3 | 17250 |
| 4 | 210794 |
| 5 | 2101418 |
| 6 | 17796503 |
| 7 | 131648504 |
| 8 | 868101374 |
| 9 | 5182032940 |
| 10 | 28344317261 |
| 11 | 143450494506 |
| 12 | 677150551521 |
| 13 | 3001361428036 |
| 14 | 12561988338047 |
| 15 | 49889607533966 |
| 16 | 188796675237026 |
| 17 | 683282982630926 |
| 18 | 2372613717733406 |
[1,46,1080,17250,210794,2101418,17796503, 131648504,868101374,5182032940,28344317261, 143450494506,677150551521,3001361428036, 12561988338047,49889607533966,188796675237026, 683282982630926,2372613717733406] |