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 | 8 |
| 3 | 44 |
| 4 | 417 |
| 5 | 4545 |
| 6 | 69905 |
| 7 | 1207937 |
| 8 | 24904806 |
| 9 | 575256641 |
| 10 | 14947281595 |
| 11 | 427836523971 |
| 12 | 13429362462839 |
| 13 | 457637290140469 |
| 14 | 16843379604615375 |
| 15 | 665494379869134005 |
| 16 | 28102480944522059434 |
| 17 | 1262906802939553227382 |
| 18 | 60182948301301262753877 |