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 | 10 |
| 2 | 39 |
| 3 | 155 |
| 4 | 371 |
| 5 | 10225245560 |
| 6 | 2935561623745 |
| 7 | 454539357304421 |
| 8 | 7228559051256366318 |
| 9 | 1390718713078158117206 |