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 | 11 |
| 2 | 73 |
| 3 | 403 |
| 4 | 2021 |
| 5 | 9567 |
| 6 | 43611 |
| 7 | 193683 |
| 8 | 844213 |
| 9 | 3629083 |
| 10 | 15437951 |
| 11 | 65143503 |
| 12 | 273148279 |
| 13 | 1139548469 |
| 14 | 4734740493 |
| 15 | 19606960755 |
| 16 | 80969809797 |
| 17 | 333601494651 |