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 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 49 |
| 5 | 127 |
| 6 | 321 |
| 7 | 813 |
| 8 | 2041 |
| 9 | 5117 |
| 10 | 12763 |
| 11 | 31791 |
| 12 | 78917 |
| 13 | 195677 |
| 14 | 483997 |
| 15 | 1196081 |
| 16 | 2950439 |
| 17 | 7271905 |