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| n | a(n) |
|---|---|
| 1 | 520 |
| 2 | 4750 |
| 3 | 36952 |
| 4 | 293464 |
| 5 | 2591502 |
| 6 | 23380862 |
| 7 | 210222830 |
| 8 | 1882624856 |
| 9 | 16911040968 |
| 10 | 152565274262 |
| 11 | 1381204433968 |
| 12 | 12534862082614 |
| 13 | 113983746333928 |
| 14 | 1038347313892636 |
| 15 | 9474508237939826 |
| 16 | 86579678278534962 |
| 17 | 792234931151418444 |
[520,4750,36952,293464,2591502,23380862,210222830, 1882624856,16911040968,152565274262,1381204433968, 12534862082614,113983746333928,1038347313892636, 9474508237939826,86579678278534962, 792234931151418444] |