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 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 17 |
| 5 | 71 |
| 6 | 107 |
| 7 | 503 |
| 8 | 881 |
| 9 | 1103 |
| 10 | 1301 |
| 11 | 9521 |
| 12 | 15671 |
| 13 | 19543 |
| 14 | 31387 |
| 15 | 155849 |
| 16 | 360289 |
| 17 | 370061 |
| 18 | 492067 |
| 19 | 1349147 |
| 20 | 1356869 |
| 21 | 2010553 |
| 22 | 4652239 |
| 23 | 17051297 |
| 24 | 20831119 |
| 25 | 47326519 |
| 26 | 122164649 |
| 27 | 189695483 |
| 28 | 191912659 |