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 | 9 |
| 4 | 38 |
| 5 | 215 |
| 6 | 1384 |
| 7 | 10409 |
| 8 | 86946 |
| 9 | 825075 |
| 10 | 8541998 |
| 11 | 97590779 |
| 12 | 1205343952 |
| 13 | 16148472977 |
| 14 | 231416203212 |
| 15 | 3560209750005 |
| 16 | 58104163643054 |
| 17 | 1008693571819919 |
| 18 | 18477578835352366 |
| 19 | 357476371577422955 |
| 20 | 7258865626801695048 |
| 21 | 154893910336866444009 |
| 22 | 3454112338490001478772 |