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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | -1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -4 |
| 9 | 2 |
| 10 | 0 |
| 11 | 1 |
| 12 | -5 |
| 13 | 3 |
| 14 | -3 |
| 15 | 0 |
| 16 | 1 |
| 17 | -4 |
| 18 | 17 |
| 19 | -10 |
| 20 | 5 |
| 21 | 0 |
| 22 | 1 |
| 23 | -35 |
| 24 | 287 |
| 25 | -118 |
| 26 | 691 |
| 27 | -691 |
| 28 | 0 |
| 29 | 1 |
| 30 | -8 |
| 31 | 112 |
| 32 | -352 |
| 33 | 718 |
| 34 | -280 |
| 35 | 140 |
| 36 | 0 |
| 37 | 1 |
| 38 | -21 |
| 39 | 66 |
| 40 | -293 |
| 41 | 4557 |
| 42 | -3711 |
| 43 | 10851 |
| 44 | -10851 |
| 45 | 0 |
| 46 | 1 |
| 47 | -40 |
| 48 | 217 |
| 49 | -4516 |
| 50 | 2829 |
| 51 | -26332 |
| 52 | 750167 |
| 53 | -438670 |
| 54 | 219335 |
| 55 | 0 |
| 56 | 1 |
| 57 | -33 |
| 58 | 506 |
| 59 | -2585 |
| 60 | 7579 |
| 61 | -198793 |
| 62 | 1540967 |
| 63 | -627073 |
| 64 | 1222277 |
| 65 | -1222277 |
| 66 | 0 |