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 | -1 |
| 3 | -1 |
| 4 | -2 |
| 5 | -2 |
| 6 | -1 |
| 7 | 1 |
| 8 | 5 |
| 9 | 11 |
| 10 | 18 |
| 11 | 24 |
| 12 | 25 |
| 13 | 15 |
| 14 | -13 |
| 15 | -65 |
| 16 | -142 |
| 17 | -234 |
| 18 | -313 |
| 19 | -327 |
| 20 | -199 |
| 21 | 163 |
| 22 | 838 |
| 23 | 1840 |
| 24 | 3041 |
| 25 | 4079 |
| 26 | 4279 |
| 27 | 2639 |
| 28 | -2042 |
| 29 | -10802 |
| 30 | -23841 |
| 31 | -39519 |
| 32 | -53155 |
| 33 | -55989 |
| 34 | -34982 |
| 35 | 25544 |
| 36 | 139225 |
| 37 | 308895 |
| 38 | 513547 |
| 39 | 692655 |