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 | 7 |
| 2 | 2911 |
| 3 | 40391 |
| 4 | 242047 |
| 5 | 950599 |
| 6 | 2883167 |
| 7 | 7338631 |
| 8 | 16451071 |
| 9 | 33489287 |
| 10 | 63202399 |
| 11 | 112211527 |
| 12 | 189447551 |
| 13 | 306634951 |
| 14 | 478821727 |
| 15 | 724955399 |
| 16 | 1068505087 |
| 17 | 1538129671 |
| 18 | 2168392031 |
| 19 | 3000519367 |
| 20 | 4083209599 |
| 21 | 5473483847 |
| 22 | 7237584991 |
| 23 | 9451922311 |
| 24 | 12204062207 |
| 25 | 15593764999 |