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 | 3 |
| 2 | 4 |
| 3 | 5 |
| 4 | 7 |
| 5 | 12 |
| 6 | 15 |
| 7 | 26 |
| 8 | 31 |
| 9 | 50 |
| 10 | 71 |
| 11 | 186 |
| 12 | 273 |
| 13 | 366 |
| 14 | 1542 |
| 15 | 1929 |
| 16 | 3687 |
| 17 | 4407 |
| 18 | 15395 |
| 19 | 15433 |