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 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 44 |
| 5 | 186 |
| 6 | 812 |
| 7 | 3614 |
| 8 | 16259 |
| 9 | 73558 |
| 10 | 333683 |
| 11 | 1515454 |
| 12 | 6885303 |
| 13 | 31283654 |
| 14 | 142121322 |
| 15 | 645545957 |
| 16 | 2931714681 |
| 17 | 13312277095 |
| 18 | 60440946141 |
| 19 | 274391188445 |
| 20 | 1245601594285 |
| 21 | 5654137180147 |
| 22 | 25664803641528 |
| 23 | 116492672036579 |
| 24 | 528751598530367 |