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 | 0 |
| 3 | -2 |
| 4 | 5 |
| 5 | -2 |
| 6 | 7 |
| 7 | -6 |
| 8 | 11 |
| 9 | -20 |
| 10 | 13 |
| 11 | -32 |
| 12 | 31 |
| 13 | -50 |
| 14 | 60 |
| 15 | -70 |
| 16 | 124 |
| 17 | -112 |
| 18 | 192 |
| 19 | -198 |
| 20 | 295 |
| 21 | -364 |
| 22 | 422 |
| 23 | -616 |
| 24 | 661 |
| 25 | -1002 |
| 26 | 1034 |
| 27 | -1500 |
| 28 | 1737 |
| 29 | -2208 |
| 30 | 2808 |
| 31 | -3234 |
| 32 | 4462 |
| 33 | -4876 |
| 34 | 6735 |
| 35 | -7464 |
| 36 | 9990 |
| 37 | -11610 |
| 38 | 14410 |
| 39 | -17866 |
| 40 | 20947 |
| 41 | -27082 |
| 42 | 30493 |
| 43 | -40056 |
| 44 | 45147 |
| 45 | -58196 |
| 46 | 66999 |
| 47 | -83278 |
| 48 | 99641 |