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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 10 |
| 6 | 20 |
| 7 | 46 |
| 8 | 90 |
| 9 | 185 |
| 10 | 374 |
| 11 | 810 |
| 12 | 1718 |
| 13 | 3565 |
| 14 | 7504 |
| 15 | 15668 |
| 16 | 32880 |
| 17 | 68748 |
| 18 | 144309 |
| 19 | 302723 |
| 20 | 633904 |
| 21 | 1328936 |
| 22 | 2784579 |
| 23 | 5837343 |
| 24 | 12232245 |
| 25 | 25638253 |
| 26 | 53738027 |
| 27 | 112620095 |
| 28 | 236040957 |
| 29 | 494698039 |
| 30 | 1036837512 |
| 31 | 2173041695 |
| 32 | 4554382398 |