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 | 3 |
| 1 | 1 |
| 2 | 11 |
| 3 | 43 |
| 4 | 19 |
| 5 | 683 |
| 6 | 2731 |
| 7 | 331 |
| 8 | 43691 |
| 9 | 174763 |
| 10 | 5419 |
| 11 | 2796203 |
| 12 | 4051 |
| 13 | 87211 |
| 14 | 3033169 |
| 15 | 715827883 |
| 16 | 20857 |
| 17 | 86171 |
| 18 | 25781083 |
| 19 | 22366891 |
| 20 | 8831418697 |
| 21 | 2932031007403 |
| 22 | 18837001 |
| 23 | 165768537521 |
| 24 | 4363953127297 |
| 25 | 6529 |
| 26 | 28059810762433 |
| 27 | 48912491 |
| 28 | 160465489 |