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 | 3 |
| 2 | 7 |
| 3 | 23 |
| 4 | 71 |
| 5 | 643 |
| 6 | 457 |
| 7 | 311 |
| 8 | 191 |
| 9 | 2161 |
| 10 | 15791 |
| 11 | 5881 |
| 12 | 36721 |
| 13 | 156601 |
| 14 | 95471 |
| 15 | 275641 |
| 16 | 161831 |
| 17 | 712321 |
| 18 | 1171921 |
| 19 | 3384481 |
| 20 | 3659401 |
| 21 | 760321 |
| 22 | 7510801 |
| 23 | 16889161 |
| 24 | 6366361 |
| 25 | 17551561 |
| 26 | 29418841 |
| 27 | 49443241 |
| 28 | 33358081 |
| 29 | 67992961 |
| 30 | 90441961 |
| 31 | 184254841 |