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 | 15 |
| 1 | 51 |
| 2 | 85 |
| 3 | 150 |
| 4 | 771 |
| 5 | 1285 |
| 6 | 2310 |
| 7 | 4369 |
| 8 | 8466 |
| 9 | 16660 |
| 10 | 33047 |
| 11 | 196611 |
| 12 | 327685 |
| 13 | 589830 |
| 14 | 1114129 |
| 15 | 2162706 |
| 16 | 4259860 |
| 17 | 8454167 |
| 18 | 16843009 |
| 19 | 33620226 |
| 20 | 67174660 |
| 21 | 134283527 |
| 22 | 268501264 |
| 23 | 536936723 |
| 24 | 1073807637 |
| 25 | 2147549462 |
| 26 | 12884901891 |