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) |
|---|---|
| 0 | 5 |
| 1 | 19 |
| 2 | 75 |
| 3 | 299 |
| 4 | 1195 |
| 5 | 4779 |
| 6 | 19115 |
| 7 | 76459 |
| 8 | 305835 |
| 9 | 1223339 |
| 10 | 4893355 |
| 11 | 19573419 |
| 12 | 78293675 |
| 13 | 313174699 |
| 14 | 1252698795 |
| 15 | 5010795179 |
| 16 | 20043180715 |
| 17 | 80172722859 |
| 18 | 320690891435 |
| 19 | 1282763565739 |
| 20 | 5131054262955 |
| 21 | 20524217051819 |
| 22 | 82096868207275 |
| 23 | 328387472829099 |
| 24 | 1313549891316395 |