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 | 2 |
| 4 | 5 |
| 5 | 14 |
| 6 | 49 |
| 7 | 258 |
| 8 | 1385 |
| 9 | 1342 |
| 10 | -13739 |
| 11 | 1727362 |
| 12 | 20549165 |
| 13 | -892047378 |
| 14 | -13084315271 |
| 15 | 979519187138 |
| 16 | 16158974238545 |
| 17 | -1747908612654946 |
| 18 | -32246548780758179 |
| 19 | 4903305033480792642 |
| 20 | 100032668564662494485 |
| 21 | -20685044415403212103730 |
| 22 | -462550882810484735564351 |