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 | 6 |
| 2 | 34 |
| 3 | 186 |
| 4 | 1058 |
| 5 | 6026 |
| 6 | 34354 |
| 7 | 195866 |
| 8 | 1116738 |
| 9 | 6367146 |
| 10 | 36302674 |
| 11 | 206981946 |
| 12 | 1180120418 |
| 13 | 6728529866 |
| 14 | 38363130994 |
| 15 | 218729774426 |
| 16 | 1247101396098 |
| 17 | 7110426078186 |
| 18 | 40540535975314 |
| 19 | 231144384189306 |
| 20 | 1317884064847778 |