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 | -2 |
| 3 | -2 |
| 4 | 1 |
| 5 | 1 |
| 6 | -4 |
| 7 | 0 |
| 8 | 10 |
| 9 | 0 |
| 10 | -4 |
| 11 | 1 |
| 12 | 1 |
| 13 | -6 |
| 14 | 6 |
| 15 | 19 |
| 16 | -24 |
| 17 | -24 |
| 18 | 19 |
| 19 | 6 |
| 20 | -6 |
| 21 | 1 |
| 22 | 1 |
| 23 | -8 |
| 24 | 16 |
| 25 | 20 |
| 26 | -80 |
| 27 | -8 |
| 28 | 134 |
| 29 | -8 |
| 30 | -80 |
| 31 | 20 |
| 32 | 16 |
| 33 | -8 |
| 34 | 1 |
| 35 | 1 |
| 36 | -10 |
| 37 | 30 |
| 38 | 5 |
| 39 | -160 |
| 40 | 128 |
| 41 | 330 |
| 42 | -340 |
| 43 | -340 |
| 44 | 330 |
| 45 | 128 |
| 46 | -160 |
| 47 | 5 |
| 48 | 30 |
| 49 | -10 |
| 50 | 1 |
| 51 | 1 |
| 52 | -12 |
| 53 | 48 |
| 54 | -34 |
| 55 | -240 |
| 56 | 468 |
| 57 | 399 |
| 58 | -1416 |
| 59 | -192 |
| 60 | 2020 |
| 61 | -192 |
| 62 | -1416 |
| 63 | 399 |
| 64 | 468 |
| 65 | -240 |
| 66 | -34 |
| 67 | 48 |
| 68 | -12 |
| 69 | 1 |