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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 39 |
| 3 | 340 |
| 4 | 3041 |
| 5 | 28718 |
| 6 | 279987 |
| 7 | 2788464 |
| 8 | 28256709 |
| 9 | 290124182 |
| 10 | 3010689527 |
| 11 | 31516942060 |
| 12 | 332347297141 |
| 13 | 3526399820374 |
| 14 | 37616896717155 |
| 15 | 403127408462816 |
| 16 | 4337723615579781 |
| 17 | 46842172878701486 |
| 18 | 507454305359968827 |
| 19 | 5513119883595629556 |
| 20 | 60050379276555861857 |
| 21 | 655611405802102543086 |
[1,6,39,340,3041,28718,279987,2788464,28256709, 290124182,3010689527,31516942060,332347297141, 3526399820374,37616896717155,403127408462816, 4337723615579781,46842172878701486, 507454305359968827,5513119883595629556, 60050379276555861857,655611405802102543086] |