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 | 15 |
| 4 | 27 |
| 5 | 354 |
| 6 | 893 |
| 7 | 2127 |
| 8 | 2133 |
| 9 | 2427 |
| 10 | 2649 |
| 11 | 4098 |
| 12 | 4107 |
| 13 | 6189 |
| 14 | 19721 |
| 15 | 124064 |
| 16 | 140287 |
| 17 | 1200685 |
| 18 | 17347808 |
| 19 | 18209035 |
| 20 | 32738176 |
| 21 | 35033632 |