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 | 4 |
| 2 | 6 |
| 3 | 33 |
| 4 | 36 |
| 5 | 38 |
| 6 | 64 |
| 7 | 66 |
| 8 | 137 |
| 9 | 569 |
| 10 | 5216 |
| 11 | 367807 |
| 12 | 939788 |
| 13 | 6369040 |
| 14 | 7885439 |
| 15 | 9536130 |
| 16 | 140292678 |
| 17 | 184151167 |
| 18 | 890838664 |
| 19 | 912903446 |
| 20 | 3171881613 |