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 | 2 |
| 2 | 7 |
| 3 | 12 |
| 4 | 37 |
| 5 | 50 |
| 6 | 187 |
| 7 | 128 |
| 8 | 1057 |
| 9 | -502 |
| 10 | 7679 |
| 11 | -14420 |
| 12 | 73453 |
| 13 | -212554 |
| 14 | 843019 |
| 15 | -2848064 |
| 16 | 10602409 |
| 17 | -37875706 |
| 18 | 139533151 |
| 19 | -510006524 |
| 20 | 1885309253 |
| 21 | -6974175142 |
| 22 | 25940881947 |
| 23 | -96731191728 |
| 24 | 361980829841 |
| 25 | -1358121976978 |
| 26 | 5109416286295 |
| 27 | -19267391982612 |