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 | 5 |
| 4 | 14 |
| 5 | 42 |
| 6 | 131 |
| 7 | 417 |
| 8 | 1341 |
| 9 | 4334 |
| 10 | 14042 |
| 11 | 45562 |
| 12 | 148029 |
| 13 | 481804 |
| 14 | 1572625 |
| 15 | 5156025 |
| 16 | 17018505 |
| 17 | 56717910 |
| 18 | 191540940 |
| 19 | 658084182 |
| 20 | 2309516616 |