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 | 0 |
| 2 | -1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -2 |
| 6 | 2 |
| 7 | 1 |
| 8 | -4 |
| 9 | 3 |
| 10 | 3 |
| 11 | -8 |
| 12 | 4 |
| 13 | 8 |
| 14 | -15 |
| 15 | 4 |
| 16 | 19 |
| 17 | -27 |
| 18 | 0 |
| 19 | 42 |
| 20 | -46 |
| 21 | -15 |
| 22 | 88 |
| 23 | -73 |
| 24 | -57 |
| 25 | 176 |
| 26 | -104 |
| 27 | -160 |
| 28 | 337 |
| 29 | -120 |
| 30 | -393 |
| 31 | 617 |
| 32 | -64 |
| 33 | -890 |
| 34 | 1074 |
| 35 | 209 |
| 36 | -1900 |
| 37 | 1755 |
| 38 | 1035 |
| 39 | -3864 |
| 40 | 2620 |
| 41 | 3144 |
| 42 | -7519 |
| 43 | 3340 |
| 44 | 8043 |
| 45 | -14003 |
| 46 | 2816 |
| 47 | 18706 |
| 48 | -24862 |
| 49 | -1887 |
| 50 | 40752 |
| 51 | -41681 |
| 52 | -17777 |
| 53 | 84320 |
| 54 | -64656 |
| 55 | -60416 |
| 56 | 166753 |
| 57 | -88560 |
| 58 | -162513 |