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 | 25 |
| 3 | 1677 |
| 4 | 21875 |
| 5 | 538513 |
| 6 | 1015989 |
| 7 | 18522325 |
| 8 | 1130976595 |
| 9 | 1721158369 |
| 10 | 561122374231 |
| 11 | 1763726985077 |
| 12 | 2735295422833 |
| 13 | 7631117283951 |
| 14 | 22809199833151 |
| 15 | 46929434362563 |
| 16 | 49217568518075 |
| 17 | 151990420653423 |
| 18 | 174172511353413 |
| 19 | 1258223430425543 |