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 | 9 |
| 3 | 24 |
| 4 | 61 |
| 5 | 151 |
| 6 | 369 |
| 7 | 896 |
| 8 | 2169 |
| 9 | 5243 |
| 10 | 12665 |
| 11 | 30584 |
| 12 | 73845 |
| 13 | 178287 |
| 14 | 430433 |
| 15 | 1039168 |
| 16 | 2508785 |
| 17 | 6056755 |
| 18 | 14622313 |
| 19 | 35301400 |
| 20 | 85225133 |
| 21 | 205751687 |
| 22 | 496728529 |
| 23 | 1199208768 |
| 24 | 2895146089 |
| 25 | 6989500971 |
| 26 | 16874148057 |
| 27 | 40737797112 |
| 28 | 98349742309 |