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 | 16 |
| 4 | 61 |
| 5 | 206 |
| 6 | 659 |
| 7 | 2052 |
| 8 | 6297 |
| 9 | 19162 |
| 10 | 58015 |
| 11 | 175088 |
| 12 | 527333 |
| 13 | 1586118 |
| 14 | 4766571 |
| 15 | 14316124 |
| 16 | 42981169 |
| 17 | 129009074 |
| 18 | 387158327 |
| 19 | 1161737160 |
| 20 | 3485735805 |
| 21 | 10458256030 |
| 22 | 31376865283 |
| 23 | 94134790196 |
| 24 | 282412759241 |
| 25 | 847255054986 |
| 26 | 2541798719439 |
| 27 | 7625463267232 |