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 | 0 |
| 1 | 1 |
| 2 | -16 |
| 3 | -318 |
| 4 | -1895 |
| 5 | -6936 |
| 6 | -19313 |
| 7 | -45055 |
| 8 | -92831 |
| 9 | -174433 |
| 10 | -305249 |
| 11 | -504751 |
| 12 | -796967 |
| 13 | -1210969 |
| 14 | -1781345 |
| 15 | -2548687 |
| 16 | -3560063 |
| 17 | -4869505 |
| 18 | -6538481 |
| 19 | -8636383 |
| 20 | -11240999 |
| 21 | -14439001 |
| 22 | -18326417 |
| 23 | -23009119 |
| 24 | -28603295 |
| 25 | -35235937 |
| 26 | -43045313 |
| 27 | -52181455 |
| 28 | -62806631 |
| 29 | -75095833 |
| 30 | -89237249 |