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 | 21 |
| 3 | 65 |
| 4 | 297 |
| 5 | 1145 |
| 6 | 4545 |
| 7 | 19285 |
| 8 | 73173 |
| 9 | 293485 |
| 10 | 1174301 |
| 11 | 4691685 |
| 12 | 18783765 |
| 13 | 75169557 |
| 14 | 300727177 |
| 15 | 1202632389 |