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 | 10 |
| 3 | 21 |
| 4 | 106 |
| 5 | 107 |
| 6 | 750 |
| 7 | 1501 |
| 8 | 4504 |
| 9 | 4505 |
| 10 | 49556 |
| 11 | 49557 |
| 12 | 644242 |
| 13 | 644243 |
| 14 | 644244 |
| 15 | 1288489 |
| 16 | 21904314 |
| 17 | 21904315 |
| 18 | 416181986 |
| 19 | 416181987 |
| 20 | 416181988 |
| 21 | 416181989 |
| 22 | 9572185748 |
| 23 | 9572185749 |
| 24 | 47860928746 |
| 25 | 47860928747 |
| 26 | 143582786242 |