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 | 0 |
| 2 | 3 |
| 3 | 5 |
| 4 | 8 |
| 5 | 39 |
| 6 | 105 |
| 7 | 136 |
| 8 | 715 |
| 9 | 1869 |
| 10 | 2448 |
| 11 | 12815 |
| 12 | 33553 |
| 13 | 43920 |
| 14 | 229971 |
| 15 | 602069 |
| 16 | 788120 |
| 17 | 4126647 |
| 18 | 10803705 |
| 19 | 14142232 |
| 20 | 74049691 |
| 21 | 193864605 |
| 22 | 253772064 |
| 23 | 1328767775 |
| 24 | 3478759201 |
| 25 | 4553754912 |
| 26 | 23843770275 |
| 27 | 62423800997 |
| 28 | 81713816360 |
| 29 | 427859097159 |
| 30 | 1120149658761 |