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 | 7 |
| 4 | 19 |
| 5 | 47 |
| 6 | 125 |
| 7 | 310 |
| 8 | 803 |
| 9 | 2020 |
| 10 | 5144 |
| 11 | 12986 |
| 12 | 32829 |
| 13 | 82728 |
| 14 | 208461 |
| 15 | 524092 |
| 16 | 1317284 |
| 17 | 3305350 |
| 18 | 8291010 |
| 19 | 20770830 |