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 | 10 |
| 3 | 60 |
| 4 | 343 |
| 5 | 1968 |
| 6 | 11319 |
| 7 | 65351 |
| 8 | 378690 |
| 9 | 2201772 |
| 10 | 12839896 |
| 11 | 75076505 |
| 12 | 440016174 |
| 13 | 2584289200 |
| 14 | 15206283135 |
| 15 | 89625150180 |
| 16 | 529040216175 |
| 17 | 3127061645796 |
| 18 | 18506252646420 |
| 19 | 109644576096980 |
| 20 | 650280444390382 |