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 | 1 |
| 1 | 1 |
| 2 | 683 |
| 3 | 44287 |
| 4 | 838861 |
| 5 | 8138021 |
| 6 | 51828151 |
| 7 | 247165843 |
| 8 | 954437177 |
| 9 | 3138105961 |
| 10 | 9090909091 |
| 11 | 23775972551 |
| 12 | 57154490053 |
| 13 | 128011456717 |
| 14 | 269971011311 |
| 15 | 540609741211 |
| 16 | 1034834473201 |
| 17 | 1903994239313 |
| 18 | 3382547898907 |
| 19 | 5824512944911 |