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 | 2 |
| 1 | 7 |
| 2 | 23 |
| 3 | 76 |
| 4 | 255 |
| 5 | 869 |
| 6 | 3003 |
| 7 | 10504 |
| 8 | 37128 |
| 9 | 132430 |
| 10 | 476102 |
| 11 | 1723528 |
| 12 | 6277505 |
| 13 | 22988385 |
| 14 | 84592275 |
| 15 | 312636240 |
| 16 | 1159979700 |
| 17 | 4319218530 |
| 18 | 16134883410 |
| 19 | 60452176200 |
| 20 | 227110782990 |
| 21 | 855361970034 |
| 22 | 3228982640478 |