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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 22 |
| 3 | 463 |
| 4 | 9724 |
| 5 | 204205 |
| 6 | 4288306 |
| 7 | 90054427 |
| 8 | 1891142968 |
| 9 | 39714002329 |
| 10 | 833994048910 |
| 11 | 17513875027111 |
| 12 | 367791375569332 |
| 13 | 7723618886955973 |
| 14 | 162195996626075434 |
| 15 | 3406115929147584115 |
| 16 | 71528434512099266416 |
| 17 | 1502097124754084594737 |
| 18 | 31544039619835776489478 |
[0,1,22,463,9724,204205,4288306,90054427, 1891142968,39714002329,833994048910, 17513875027111,367791375569332,7723618886955973, 162195996626075434,3406115929147584115, 71528434512099266416,1502097124754084594737, 31544039619835776489478] |