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 | 1 |
| 3 | 7 |
| 4 | 115 |
| 5 | 3205 |
| 6 | 138345 |
| 7 | 8543519 |
| 8 | 714313647 |
| 9 | 77657039081 |
| 10 | 10644520988729 |
| 11 | 1795436642957911 |
| 12 | 365404877299993475 |
| 13 | 88285106031863804877 |
| 14 | 24979640229199673829201 |
| 15 | 8181329846390271384540511 |
| 16 | 3070780080199883964109428031 |
| 17 | 1309389328134899673857450461905 |