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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 13 |
| 3 | 112 |
| 4 | 587 |
| 5 | 3631 |
| 6 | 21166 |
| 7 | 126119 |
| 8 | 745178 |
| 9 | 4416695 |
| 10 | 26150120 |
| 11 | 154877307 |
| 12 | 917205757 |
| 13 | 5431915952 |
| 14 | 32169045631 |
| 15 | 190512481196 |
| 16 | 1128258633821 |
| 17 | 6681806858103 |
| 18 | 39571194265886 |
| 19 | 234349700556332 |
| 20 | 1387872742075595 |
[5,13,112,587,3631,21166,126119,745178,4416695, 26150120,154877307,917205757,5431915952, 32169045631,190512481196,1128258633821, 6681806858103,39571194265886,234349700556332, 1387872742075595] |