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 | 4 |
| 2 | 5 |
| 3 | 6 |
| 4 | 8 |
| 5 | 19 |
| 6 | 48 |
| 7 | 124 |
| 8 | 323 |
| 9 | 844 |
| 10 | 2208 |
| 11 | 5779 |
| 12 | 15128 |
| 13 | 39604 |
| 14 | 103683 |
| 15 | 271444 |
| 16 | 710648 |
| 17 | 1860499 |
| 18 | 4870848 |
| 19 | 12752044 |
| 20 | 33385283 |
| 21 | 87403804 |
| 22 | 228826128 |
| 23 | 599074579 |
| 24 | 1568397608 |
| 25 | 4106118244 |
| 26 | 10749957123 |
| 27 | 28143753124 |
| 28 | 73681302248 |