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 | 8 |
| 4 | 18 |
| 5 | 19 |
| 6 | 50 |
| 7 | 140 |
| 8 | 141 |
| 9 | 391 |
| 10 | 1079 |
| 11 | 21986 |
| 12 | 59824 |
| 13 | 59825 |
| 14 | 162694 |
| 15 | 162695 |
| 16 | 442342 |
| 17 | 1202520 |
| 18 | 3268920 |
| 19 | 24154825 |
| 20 | 65659825 |
| 21 | 485165015 |
| 22 | 1318815534 |
| 23 | 1318815535 |
| 24 | 26489121866 |
| 25 | 72004899050 |
| 26 | 195729609117 |
| 27 | 532048240264 |
| 28 | 1446257063927 |