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 | 3 |
| 3 | 51 |
| 4 | 129 |
| 5 | 125869 |
| 6 | 158287 |
| 7 | 1723647 |
| 8 | 1839003 |
| 9 | 90808797 |
| 10 | 3661886147 |
| 11 | 7368982721 |
| 12 | 130424652229 |
| 13 | 1616928424359 |
| 14 | 4003183891851 |
| 15 | 66657658685869 |