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 | 15 |
| 3 | 207 |
| 4 | 2544 |
| 5 | 30091 |
| 6 | 347096 |
| 7 | 3931343 |
| 8 | 43906441 |
| 9 | 484912312 |
| 10 | 5306957044 |