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 | 5 |
| 2 | 17 |
| 3 | 61 |
| 4 | 257 |
| 5 | 1073 |
| 6 | 4433 |
| 7 | 18161 |
| 8 | 73937 |
| 9 | 299633 |
| 10 | 1210193 |
| 11 | 4875761 |
| 12 | 19608017 |
| 13 | 78746993 |
| 14 | 315932753 |
| 15 | 1266565361 |