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 | 2 |
| 2 | 4 |
| 3 | 13 |
| 4 | 47 |
| 5 | 107 |
| 6 | 643 |
| 7 | 1439 |
| 8 | 2879 |
| 9 | 34549 |
| 10 | 138197 |
| 11 | 858239 |
| 12 | 2029439 |
| 13 | 36449279 |