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 | 31 |
| 3 | 107 |
| 4 | 499 |
| 5 | 863 |
| 6 | 5323 |
| 7 | 6911 |
| 8 | 13499 |
| 9 | 23327 |
| 10 | 107999 |
| 11 | 131071 |
| 12 | 364499 |
| 13 | 442367 |
| 14 | 530603 |
| 15 | 1000187 |
| 16 | 1149983 |
| 17 | 2634011 |
| 18 | 2915999 |
| 19 | 3764767 |
| 20 | 4121203 |
| 21 | 5771587 |
| 22 | 6243583 |
| 23 | 7263391 |
| 24 | 7812499 |
| 25 | 9199871 |
| 26 | 13499999 |
| 27 | 14326307 |
| 28 | 14895499 |
| 29 | 15185663 |
| 30 | 16693123 |
| 31 | 19651999 |
| 32 | 20000843 |
| 33 | 20710867 |
| 34 | 24513947 |
| 35 | 29659499 |
| 36 | 31049567 |
| 37 | 33461707 |
| 38 | 38654387 |
| 39 | 50597347 |
| 40 | 53248211 |
| 41 | 57395627 |
| 42 | 59547743 |