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 | 33 |
| 4 | 96 |
| 5 | 273 |
| 6 | 749 |
| 7 | 1953 |
| 8 | 4916 |
| 9 | 12023 |
| 10 | 28642 |
| 11 | 66575 |
| 12 | 151544 |
| 13 | 338294 |
| 14 | 741880 |
| 15 | 1601048 |
| 16 | 3403936 |
| 17 | 7137386 |
| 18 | 14774713 |
| 19 | 30219025 |
| 20 | 61115184 |
| 21 | 122300146 |
| 22 | 242312186 |
| 23 | 475589389 |
| 24 | 925158391 |
| 25 | 1784529840 |
| 26 | 3414565313 |
| 27 | 6483608230 |
| 28 | 12221370425 |
| 29 | 22876263089 |
| 30 | 42534593868 |