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 | 31 |
| 4 | 97 |
| 5 | 306 |
| 6 | 961 |
| 7 | 3020 |
| 8 | 9488 |
| 9 | 29809 |
| 10 | 93648 |
| 11 | 294204 |
| 12 | 924269 |
| 13 | 2903677 |
| 14 | 9122171 |
| 15 | 28658145 |
| 16 | 90032220 |
| 17 | 282844563 |
| 18 | 888582403 |
| 19 | 2791563949 |
| 20 | 8769956796 |
| 21 | 27551631842 |
| 22 | 86556004191 |
| 23 | 271923706893 |
| 24 | 854273519913 |
| 25 | 2683779414317 |
| 26 | 8431341691876 |
| 27 | 26487841119103 |