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 | 1 |
| 2 | 7 |
| 3 | 42 |
| 4 | 310 |
| 5 | 2402 |
| 6 | 19665 |
| 7 | 166230 |
| 8 | 1440474 |
| 9 | 12712499 |
| 10 | 113765625 |
| 11 | 1029509448 |
| 12 | 9401979904 |
| 13 | 86516427946 |