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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 11 |
| 5 | 66 |
| 6 | 396 |
| 7 | 2541 |
| 8 | 16918 |
| 9 | 114235 |
| 10 | 784751 |
| 11 | 5465383 |
| 12 | 38506875 |
| 13 | 273973568 |
| 14 | 1965892336 |
| 15 | 14210246260 |
| 16 | 103381074394 |
| 17 | 756396583276 |
| 18 | 5562283001914 |
| 19 | 41088462355767 |
| 20 | 304756397971126 |
| 21 | 2268729628142801 |
| 22 | 16945855152885797 |
| 23 | 126960317019497258 |
| 24 | 953861026522007365 |