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 | 8 |
| 3 | 22 |
| 4 | 108 |
| 5 | 684 |
| 6 | 2736 |
| 7 | 13556 |
| 8 | 68972 |
| 9 | 316068 |
| 10 | 1534532 |
| 11 | 7430832 |
| 12 | 35311040 |
| 13 | 170094764 |
| 14 | 817176616 |
| 15 | 3914397580 |
| 16 | 18804795120 |
| 17 | 90252696296 |
| 18 | 433011737840 |
| 19 | 2078662232124 |
| 20 | 9975949817428 |
| 21 | 47876003240128 |
| 22 | 229786823307824 |