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) |
|---|---|
| 0 | -1 |
| 1 | 17 |
| 2 | 11 |
| 3 | 113 |
| 4 | 179 |
| 5 | 857 |
| 6 | 1931 |
| 7 | 7073 |
| 8 | 18659 |
| 9 | 61097 |
| 10 | 173051 |
| 11 | 539633 |
| 12 | 1577939 |
| 13 | 4815737 |
| 14 | 14283371 |
| 15 | 43177793 |
| 16 | 128878019 |
| 17 | 387944777 |
| 18 | 1161212891 |
| 19 | 3488881553 |
| 20 | 10456158899 |
| 21 | 31389448217 |
| 22 | 94126401611 |
| 23 | 282463090913 |
| 24 | 847221500579 |
| 25 | 2542000046057 |