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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 17 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1753 |
| 9 | 32989 |
| 10 | 125131 |
| 11 | 3070523 |
| 12 | 1 |
| 13 | 3593203 |
| 14 | 1 |
| 15 | 76922021647 |
| 16 | 6880233439 |
| 17 | 18720390952421 |
| 18 | 108514808571661 |
| 19 | 186286524362683 |
| 20 | 19499250680671 |
| 21 | 2221345311813453913 |
| 22 | 10311933282363373211 |
| 23 | 498390560021687969 |
| 24 | 991459181683 |
| 25 | 104102080827724738147651 |
| 26 | 19739193437746837432529 |