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 | 3 |
| 4 | 9 |
| 5 | 28 |
| 6 | 89 |
| 7 | 287 |
| 8 | 935 |
| 9 | 3072 |
| 10 | 10157 |
| 11 | 33767 |
| 12 | 112736 |
| 13 | 377836 |
| 14 | 1270203 |
| 15 | 4282311 |
| 16 | 14470629 |
| 17 | 49005732 |
| 18 | 166261653 |
| 19 | 565055147 |
| 20 | 1923186472 |
| 21 | 6554868916 |
| 22 | 22367933148 |
| 23 | 76417819396 |
| 24 | 261335128098 |
| 25 | 894597454360 |
| 26 | 3064970675173 |