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 | 13 |
| 3 | 701 |
| 4 | 6161 |
| 5 | 13441 |
| 6 | 18901 |
| 7 | 254813 |
| 8 | 13741001 |
| 9 | 120767921 |
| 10 | 263470481 |
| 11 | 370497401 |
| 12 | 4994844413 |
| 13 | 269351100901 |
| 14 | 2367292781281 |
| 15 | 5164548355121 |
| 16 | 7262490035501 |
| 17 | 97908939928813 |
| 18 | 5279820266120401 |
| 19 | 46403672977902241 |