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 | 1 |
| 3 | 4 |
| 4 | -5 |
| 5 | 1 |
| 6 | -8 |
| 7 | 20 |
| 8 | -9 |
| 9 | 1 |
| 10 | 16 |
| 11 | -78 |
| 12 | 59 |
| 13 | -14 |
| 14 | 1 |
| 15 | -32 |
| 16 | 324 |
| 17 | -360 |
| 18 | 135 |
| 19 | -20 |
| 20 | 1 |
| 21 | 64 |
| 22 | -1520 |
| 23 | 2254 |
| 24 | -1165 |
| 25 | 265 |
| 26 | -27 |
| 27 | 1 |
| 28 | -128 |
| 29 | 8336 |
| 30 | -15232 |
| 31 | 9954 |
| 32 | -3045 |
| 33 | 469 |
| 34 | -35 |
| 35 | 1 |
| 36 | 256 |
| 37 | -53872 |
| 38 | 113868 |
| 39 | -88508 |
| 40 | 33649 |
| 41 | -6888 |
| 42 | 770 |
| 43 | -44 |
| 44 | 1 |
| 45 | -512 |
| 46 | 405600 |
| 47 | -948840 |
| 48 | 839684 |
| 49 | -376278 |
| 50 | 95025 |
| 51 | -14028 |
| 52 | 1194 |
| 53 | -54 |