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 | 3 |
| 4 | 9 |
| 5 | 12 |
| 6 | 39 |
| 7 | 123 |
| 8 | 87 |
| 9 | 771 |
| 10 | 1473 |
| 11 | 11427 |
| 12 | 46779 |
| 13 | 19533 |
| 14 | 212559 |
| 15 | 1890093 |
| 16 | 8691981 |
| 17 | 1570137 |
| 18 | 9863961 |
| 19 | 486463449 |
| 20 | 2459255649 |
| 21 | 6337494039 |
| 22 | 16694653089 |
| 23 | 7166066763 |
| 24 | 51605000913 |
| 25 | 2729643372111 |
| 26 | 7738039298811 |
| 27 | 89176449644619 |
| 28 | 104501330075607 |
| 29 | 1554311845035993 |
| 30 | 361227369257943 |