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 | 5 |
| 4 | 12 |
| 5 | 17 |
| 6 | 80 |
| 7 | 257 |
| 8 | 1365 |
| 9 | 2987 |
| 10 | 4352 |
| 11 | 20395 |
| 12 | 45142 |
| 13 | 65537 |
| 14 | 372827 |
| 15 | 16469925 |
| 16 | 16842752 |
| 17 | 83840933 |
| 18 | 100683685 |
| 19 | 285208303 |
| 20 | 1241516897 |
| 21 | 1526725200 |
| 22 | 2768242097 |
| 23 | 4294967297 |
| 24 | 24243078582 |
| 25 | 343698067445 |
| 26 | 367941146027 |
| 27 | 18740755368795 |