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 | -3 |
| 3 | 6 |
| 4 | -8 |
| 5 | 3 |
| 6 | 21 |
| 7 | -80 |
| 8 | 180 |
| 9 | -279 |
| 10 | 217 |
| 11 | 366 |
| 12 | -2028 |
| 13 | 5203 |
| 14 | -9159 |
| 15 | 9840 |
| 16 | 3160 |
| 17 | -48159 |
| 18 | 144837 |
| 19 | -286874 |
| 20 | 377952 |
| 21 | -128397 |
| 22 | -1035539 |
| 23 | 3869760 |
| 24 | -8631060 |
| 25 | 13248361 |
| 26 | -9982143 |
| 27 | -18429714 |
| 28 | 98483932 |
| 29 | -250144797 |
| 30 | 436552881 |
| 31 | -460740320 |
| 32 | -177582480 |
| 33 | 2351521281 |