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 | 1 |
| 1 | 3 |
| 2 | 3 |
| 3 | 3 |
| 4 | 9 |
| 5 | 15 |
| 6 | 33 |
| 7 | 63 |
| 8 | 153 |
| 9 | 219 |
| 10 | 261 |
| 11 | 351 |
| 12 | 585 |
| 13 | 879 |
| 14 | 933 |
| 15 | 1233 |
| 16 | 1401 |
| 17 | 1899 |
| 18 | 2301 |
| 19 | 3111 |