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 | 15 |
| 4 | 63 |
| 5 | 267 |
| 6 | 1107 |
| 7 | 4623 |
| 8 | 19071 |
| 9 | 78987 |
| 10 | 324543 |
| 11 | 1337511 |
| 12 | 5483235 |
| 13 | 22527315 |
| 14 | 92200455 |
| 15 | 377965479 |
| 16 | 1544925891 |
| 17 | 6322891707 |