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 | 7 |
| 2 | 34 |
| 3 | 146 |
| 4 | 599 |
| 5 | 2417 |
| 6 | 9696 |
| 7 | 38820 |
| 8 | 155325 |
| 9 | 621355 |
| 10 | 2485486 |
| 11 | 9942022 |
| 12 | 39768179 |
| 13 | 159072821 |
| 14 | 636291404 |
| 15 | 2545165752 |
| 16 | 10180663161 |
| 17 | 40722652815 |
| 18 | 162890611450 |
| 19 | 651562446010 |