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 | 3 |
| 3 | 21 |
| 4 | 609 |
| 5 | 903 |
| 6 | 2667 |
| 7 | 9429 |
| 8 | 15501 |
| 9 | 18543 |
| 10 | 26187 |
| 11 | 77343 |
| 12 | 108507 |
| 13 | 114681 |
| 14 | 159663 |
| 15 | 212541 |
| 16 | 273441 |
| 17 | 318507 |
| 18 | 405447 |
| 19 | 537747 |
| 20 | 797349 |
| 21 | 1197483 |
| 22 | 1357503 |
| 23 | 1398747 |
| 24 | 1731387 |
| 25 | 2354961 |
| 26 | 3146703 |
| 27 | 3325749 |
| 28 | 4451181 |
| 29 | 4630227 |
| 30 | 4665801 |
| 31 | 5192943 |