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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 17 |
| 7 | 37 |
| 8 | 83 |
| 9 | 191 |
| 10 | 450 |
| 11 | 1076 |
| 12 | 2610 |
| 13 | 6404 |
| 14 | 15875 |
| 15 | 39676 |
| 16 | 99880 |
| 17 | 253016 |
| 18 | 644524 |
| 19 | 1649918 |
| 20 | 4242226 |