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 | 20 |
| 2 | 212 |
| 3 | 2351 |
| 4 | 15127 |
| 5 | 178707 |
| 6 | 1981891 |
| 7 | 21979508 |
| 8 | 141422324 |
| 9 | 1670731762 |
| 10 | 18528699171 |
| 11 | 205486422643 |
| 12 | 2278879348244 |
| 13 | 14662949395604 |
| 14 | 173224810531570 |
| 15 | 1921092587268915 |
| 16 | 21305243270489635 |
| 17 | 236278768562654900 |