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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 39 |
| 4 | 760 |
| 5 | 6494 |
| 6 | 55518 |
| 7 | 1095199 |
| 8 | 9363623 |
| 9 | 80056197 |
| 10 | 1579275478 |
| 11 | 13502337152 |
| 12 | 115440979836 |
| 13 | 2277314143357 |
| 14 | 19470360808841 |
| 15 | 166465812866595 |
| 16 | 3283885415444596 |
| 17 | 28076246784010850 |
| 18 | 240043586712649434 |
| 19 | 4735360491756963355 |
| 20 | 40485928392182836139 |
[1,5,39,760,6494,55518,1095199,9363623,80056197, 1579275478,13502337152,115440979836,2277314143357, 19470360808841,166465812866595,3283885415444596, 28076246784010850,240043586712649434, 4735360491756963355,40485928392182836139] |