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 | 4 |
| 2 | 25 |
| 3 | 174 |
| 4 | 1270 |
| 5 | 10250 |
| 6 | 86027 |
| 7 | 738597 |
| 8 | 6497407 |
| 9 | 58047180 |
| 10 | 524733511 |
| 11 | 4789919653 |
| 12 | 44073509102 |
| 13 | 408231310520 |