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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 271 |
| 4 | 3251 |
| 5 | 38993 |
| 6 | 467903 |
| 7 | 5614831 |
| 8 | 67377943 |
| 9 | 808535311 |
| 10 | 9702423659 |
| 11 | 116429083879 |
| 12 | 1397149006493 |
| 13 | 16765788077893 |
| 14 | 201189456934709 |
| 15 | 2414273483216333 |
| 16 | 28971281798595971 |
| 17 | 347655381583151639 |
| 18 | 4171864578997819661 |
| 19 | 50062374947973835871 |
| 20 | 600748499375686030387 |
| 21 | 7208981992508232364591 |
[2,23,271,3251,38993,467903,5614831,67377943, 808535311,9702423659,116429083879,1397149006493, 16765788077893,201189456934709,2414273483216333, 28971281798595971,347655381583151639, 4171864578997819661,50062374947973835871, 600748499375686030387,7208981992508232364591] |