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) |
|---|---|
| 0 | 3 |
| 1 | 3 |
| 2 | 4 |
| 3 | 8 |
| 4 | 10 |
| 5 | 30 |
| 6 | 33 |
| 7 | 132 |
| 8 | 136 |
| 9 | 680 |
| 10 | 685 |
| 11 | 4110 |
| 12 | 4116 |
| 13 | 28812 |
| 14 | 28819 |
| 15 | 230552 |
| 16 | 230560 |
| 17 | 2075040 |
| 18 | 2075049 |
| 19 | 20750490 |
| 20 | 20750500 |
| 21 | 228255500 |
| 22 | 228255511 |
| 23 | 2739066132 |
| 24 | 2739066144 |
| 25 | 35607859872 |
| 26 | 35607859885 |
| 27 | 498510038390 |
| 28 | 498510038404 |
| 29 | 7477650576060 |
| 30 | 7477650576075 |
| 31 | 119642409217200 |