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 | 4 |
| 3 | 6 |
| 4 | 22 |
| 5 | 56 |
| 6 | 198 |
| 7 | 624 |
| 8 | 2182 |
| 9 | 7448 |
| 10 | 26319 |
| 11 | 92826 |
| 12 | 332181 |
| 13 | 1192845 |
| 14 | 4315845 |
| 15 | 15678200 |
| 16 | 57227380 |
| 17 | 209623109 |
| 18 | 770516966 |
| 19 | 2840466846 |
| 20 | 10499678185 |
| 21 | 38905008340 |
| 22 | 144475534207 |