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 | 3 |
| 2 | 7 |
| 3 | 18 |
| 4 | 44 |
| 5 | 110 |
| 6 | 273 |
| 7 | 679 |
| 8 | 1687 |
| 9 | 4191 |
| 10 | 10406 |
| 11 | 25830 |
| 12 | 64097 |
| 13 | 159015 |
| 14 | 394391 |
| 15 | 977939 |
| 16 | 2424370 |
| 17 | 5977180 |
| 18 | 14756906 |