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 | 4 |
| 2 | 21 |
| 3 | 25 |
| 4 | 205 |
| 5 | 26707 |
| 6 | 27679 |
| 7 | 3066877 |
| 8 | 3067067 |
| 9 | 3067097 |
| 10 | 3067117 |
| 11 | 3067147 |
| 12 | 3067177 |
| 13 | 3067557 |
| 14 | 3067567 |
| 15 | 3067577 |
| 16 | 3067607 |
| 17 | 3067717 |
| 18 | 348933193 |
| 19 | 348933421 |
| 20 | 348933439 |
| 21 | 44690978633 |
| 22 | 44690978899 |
| 23 | 6553736049327 |
| 24 | 6553736049407 |
| 25 | 6553736049599 |
| 26 | 6553736049631 |
| 27 | 6553736049823 |
| 28 | 6553736053327 |
| 29 | 6553736054959 |