This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 211 |
| 5 | 2311 |
| 6 | 509 |
| 7 | 277 |
| 8 | 27953 |
| 9 | 703763 |
| 10 | 34231 |
| 11 | 200560490131 |
| 12 | 676421 |
| 13 | 11072701 |
| 14 | 78339888213593 |
| 15 | 13808181181 |
| 16 | 18564761860301 |
| 17 | 19026377261 |
| 18 | 525956867082542470777 |
| 19 | 143581524529603 |
| 20 | 2892214489673 |
| 21 | 16156160491570418147806951 |
| 22 | 96888414202798247 |
| 23 | 1004988035964897329167431269 |