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) |
|---|---|
| 3 | 2 |
| 4 | 2 |
| 5 | 2 |
| 6 | 14 |
| 7 | 30 |
| 8 | 50 |
| 9 | 170 |
| 10 | 462 |
| 11 | 1014 |
| 12 | 2810 |
| 13 | 7906 |
| 14 | 19910 |
| 15 | 53278 |
| 16 | 148514 |
| 17 | 397530 |
| 18 | 1073918 |
| 19 | 2976390 |
| 20 | 8172426 |
| 21 | 22413266 |
| 22 | 62219830 |
| 23 | 172846382 |
| 24 | 479683762 |
| 25 | 1338281802 |
| 26 | 3743620974 |
| 27 | 10475828630 |
| 28 | 29389158426 |
| 29 | 82643684034 |
| 30 | 232644515366 |
| 31 | 655928162878 |
| 32 | 1852640651330 |
| 33 | 5239096953274 |