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 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 24 |
| 6 | 61 |
| 7 | 150 |
| 8 | 382 |
| 9 | 964 |
| 10 | 2452 |
| 11 | 6307 |
| 12 | 16379 |
| 13 | 42989 |
| 14 | 113965 |
| 15 | 305035 |
| 16 | 823632 |
| 17 | 2241814 |
| 18 | 6145670 |
| 19 | 16956972 |
| 20 | 47059076 |
| 21 | 131279567 |