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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 36 |
| 6 | 80 |
| 7 | 194 |
| 8 | 506 |
| 9 | 1400 |
| 10 | 4039 |
| 11 | 12044 |
| 12 | 36406 |
| 13 | 111324 |
| 14 | 342447 |
| 15 | 1064835 |
| 16 | 3341434 |
| 17 | 10583931 |
| 18 | 33728050 |
| 19 | 107931849 |
| 20 | 346616201 |