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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 17 |
| 5 | 38 |
| 6 | 91 |
| 7 | 232 |
| 8 | 632 |
| 9 | 1824 |
| 10 | 5571 |
| 11 | 17892 |
| 12 | 60355 |
| 13 | 212898 |
| 14 | 784416 |
| 15 | 3008480 |
| 16 | 11997341 |
| 17 | 49612426 |
| 18 | 212536067 |
| 19 | 941213428 |
| 20 | 4305049140 |
| 21 | 20302469824 |
| 22 | 98641434683 |
| 23 | 493038167880 |
| 24 | 2533414749409 |
| 25 | 13366134856170 |
| 26 | 72361098996208 |