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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 43 |
| 6 | 239 |
| 7 | 1663 |
| 8 | 9242 |
| 9 | 47523 |
| 10 | 351115 |
| 11 | 2015403 |
| 12 | 4026914 |
| 13 | 10143015 |
| 14 | 72872619 |
| 15 | 144151023 |
| 16 | 413384223 |