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 | 6 |
| 1 | 34 |
| 2 | 174 |
| 3 | 874 |
| 4 | 4374 |
| 5 | 21874 |
| 6 | 109374 |
| 7 | 546874 |
| 8 | 2734374 |
| 9 | 13671874 |
| 10 | 68359374 |
| 11 | 341796874 |
| 12 | 1708984374 |
| 13 | 8544921874 |
| 14 | 42724609374 |
| 15 | 213623046874 |
| 16 | 1068115234374 |
| 17 | 5340576171874 |
| 18 | 26702880859374 |
| 19 | 133514404296874 |