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 | 4 |
| 2 | 10 |
| 3 | 28 |
| 4 | 64 |
| 5 | 140 |
| 6 | 304 |
| 7 | 640 |
| 8 | 1326 |
| 9 | 2716 |
| 10 | 5502 |
| 11 | 11052 |
| 12 | 22044 |
| 13 | 43700 |
| 14 | 86180 |
| 15 | 169184 |
| 16 | 330810 |
| 17 | 644564 |
| 18 | 1251954 |
| 19 | 2424860 |
| 20 | 4684696 |
| 21 | 9029756 |
| 22 | 17368408 |
| 23 | 33343520 |
| 24 | 63899686 |
| 25 | 122259372 |
| 26 | 233568998 |
| 27 | 445600236 |
| 28 | 849014964 |
| 29 | 1615709156 |
| 30 | 3071307852 |