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 | 7 |
| 3 | 37 |
| 4 | 311 |
| 5 | 3251 |
| 6 | 47419 |
| 7 | 825259 |
| 8 | 16786615 |
| 9 | 387446284 |
| 10 | 10000130757 |
| 11 | 285312023327 |
| 12 | 8916102467195 |
| 13 | 302875111792553 |
| 14 | 11112006858124501 |
| 15 | 437893890458947787 |
| 16 | 18446744074296533175 |
| 17 | 827240261887503567287 |
| 18 | 39346408075308452154628 |