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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 41 |
| 5 | 137 |
| 6 | 347 |
| 7 | 611 |
| 8 | 5777 |
| 9 | 98321 |
| 10 | 677363 |
| 11 | -4192197 |
| 12 | -134908871 |
| 13 | -617972327 |
| 14 | 22749265099 |
| 15 | 449951818387 |
| 16 | -632325203423 |
| 17 | -163681108703199 |
| 18 | -2324079456844573 |
| 19 | 33233931805782635 |
| 20 | 1734259111955765577 |
| 21 | 14135975420529458857 |
| 22 | -777499293367428199109 |