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 | 1 |
| 6 | -1 |
| 7 | 23 |
| 8 | -1 |
| 9 | 1 |
| 10 | 1 |
| 11 | -44 |
| 12 | 14 |
| 13 | -4 |
| 14 | 1 |
| 15 | -1 |
| 16 | 563 |
| 17 | -818 |
| 18 | 22 |
| 19 | -5 |
| 20 | 1 |
| 21 | 1 |
| 22 | -3254 |
| 23 | 141 |
| 24 | -1436 |
| 25 | 19 |
| 26 | -2 |
| 27 | 1 |
| 28 | -1 |
| 29 | 88069 |
| 30 | -13063 |
| 31 | 21757 |
| 32 | -457 |
| 33 | 43 |
| 34 | -7 |
| 35 | 1 |
| 36 | 1 |
| 37 | -11384 |
| 38 | 16774564 |
| 39 | -11368 |
| 40 | 7474 |
| 41 | -680 |
| 42 | 56 |
| 43 | -8 |
| 44 | 1 |
| 45 | -1 |
| 46 | 1593269 |
| 47 | -1057052 |
| 48 | 35874836 |
| 49 | -261502 |
| 50 | 3982 |
| 51 | -688 |
| 52 | 212 |
| 53 | -3 |
| 54 | 1 |
| 55 | 1 |
| 56 | -15518938 |
| 57 | 4651811 |