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 | 2 |
| 3 | 5 |
| 4 | 11 |
| 5 | 25 |
| 6 | 55 |
| 7 | 121 |
| 8 | 268 |
| 9 | 584 |
| 10 | 1268 |
| 11 | 2760 |
| 12 | 5995 |
| 13 | 13031 |
| 14 | 28247 |
| 15 | 61137 |
| 16 | 132074 |
| 17 | 285119 |
| 18 | 615190 |
| 19 | 1326561 |
| 20 | 2858429 |
| 21 | 6154567 |
| 22 | 13242165 |