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| n | a(n) |
|---|---|
| 1 | 31 |
| 2 | 961 |
| 3 | 4719 |
| 4 | 16812 |
| 5 | 106833 |
| 6 | 493471 |
| 7 | 3275898 |
| 8 | 17232331 |
| 9 | 114004725 |
| 10 | 647020166 |
| 11 | 4243514607 |
| 12 | 25257749917 |
| 13 | 164582667340 |
| 14 | 1010000577881 |
| 15 | 6556696152743 |
| 16 | 41041784984580 |
| 17 | 265986401901157 |
| 18 | 1686689372009279 |
| 19 | 10927292093193426 |
[31,961,4719,16812,106833,493471,3275898,17232331, 114004725,647020166,4243514607,25257749917, 164582667340,1010000577881,6556696152743, 41041784984580,265986401901157,1686689372009279, 10927292093193426] |