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 | 3 |
| 2 | 4 |
| 3 | 18 |
| 4 | 59 |
| 5 | 204 |
| 6 | 769 |
| 7 | 3098 |
| 8 | 14080 |
| 9 | 63868 |
| 10 | 261240 |
| 11 | 1030917 |
| 12 | 4350280 |
| 13 | 20376408 |
| 14 | 100217091 |
| 15 | 480075932 |
| 16 | 2180836235 |
| 17 | 9678232728 |
| 18 | 44364200452 |
| 19 | 215530397762 |
| 20 | 1076559054832 |
| 21 | 5260403805411 |
| 22 | 24406081179847 |