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 | 13 |
| 4 | 83 |
| 5 | 817 |
| 6 | 9065 |
| 7 | 121795 |
| 8 | 1850384 |
| 9 | 31964686 |
| 10 | 612859952 |
| 11 | 12980965588 |
| 12 | 300358150373 |
| 13 | 7548024748057 |
| 14 | 204624140789585 |
| 15 | 5954693801179750 |
| 16 | 185127523366125449 |
| 17 | 6124428454164394921 |
| 18 | 214815152433502078607 |