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) |
|---|---|
| 2 | 2 |
| 3 | 6 |
| 4 | 14 |
| 5 | 28 |
| 6 | 54 |
| 7 | 102 |
| 8 | 190 |
| 9 | 352 |
| 10 | 650 |
| 11 | 1198 |
| 12 | 2206 |
| 13 | 4060 |
| 14 | 7470 |
| 15 | 13742 |
| 16 | 25278 |
| 17 | 46496 |
| 18 | 85522 |
| 19 | 157302 |
| 20 | 289326 |
| 21 | 532156 |
| 22 | 978790 |
| 23 | 1800278 |
| 24 | 3311230 |
| 25 | 6090304 |
| 26 | 11201818 |
| 27 | 20603358 |
| 28 | 37895486 |
| 29 | 69700668 |
| 30 | 128199518 |
| 31 | 235795678 |
| 32 | 433695870 |