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 | 2 |
| 2 | 7 |
| 3 | 40 |
| 4 | 321 |
| 5 | 3361 |
| 6 | 43667 |
| 7 | 679806 |
| 8 | 12358885 |
| 9 | 257281501 |
| 10 | 6039232167 |
| 11 | 157879127902 |
| 12 | 4550258562799 |
| 13 | 143367509714352 |
| 14 | 4903128661348411 |
| 15 | 180907738215049666 |
| 16 | 7163333648262397913 |
| 17 | 303006716530386750233 |