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 | -4 |
| 4 | -2 |
| 5 | 6 |
| 6 | 8 |
| 7 | -4 |
| 8 | -16 |
| 9 | -6 |
| 10 | 20 |
| 11 | 24 |
| 12 | -12 |
| 13 | -44 |
| 14 | -16 |
| 15 | 52 |
| 16 | 62 |
| 17 | -28 |
| 18 | -108 |
| 19 | -40 |
| 20 | 122 |
| 21 | 144 |
| 22 | -64 |
| 23 | -244 |
| 24 | -88 |
| 25 | 266 |
| 26 | 308 |
| 27 | -136 |
| 28 | -508 |
| 29 | -180 |
| 30 | 544 |
| 31 | 624 |
| 32 | -272 |
| 33 | -1008 |
| 34 | -356 |
| 35 | 1060 |
| 36 | 1206 |
| 37 | -524 |
| 38 | -1920 |
| 39 | -672 |
| 40 | 1988 |
| 41 | 2244 |
| 42 | -968 |
| 43 | -3524 |
| 44 | -1224 |
| 45 | 3606 |
| 46 | 4048 |
| 47 | -1732 |
| 48 | -6284 |