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 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 13 |
| 5 | 23 |
| 6 | 43 |
| 7 | 80 |
| 8 | 156 |
| 9 | 309 |
| 10 | 638 |
| 11 | 1348 |
| 12 | 2949 |
| 13 | 6607 |
| 14 | 15206 |
| 15 | 35720 |
| 16 | 85625 |
| 17 | 208588 |
| 18 | 515787 |
| 19 | 1291316 |
| 20 | 3269194 |
| 21 | 8355832 |
| 22 | 21539988 |
| 23 | 55942920 |
| 24 | 146271594 |
| 25 | 384746580 |
| 26 | 1017522228 |
| 27 | 2704227858 |
| 28 | 7219183490 |
| 29 | 19351410860 |
| 30 | 52068524665 |
| 31 | 140588391713 |
| 32 | 380824067016 |