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 | -4 |
| 2 | 1 |
| 3 | 0 |
| 4 | -7 |
| 5 | 1 |
| 6 | 0 |
| 7 | 15 |
| 8 | -10 |
| 9 | 1 |
| 10 | 0 |
| 11 | -13 |
| 12 | 39 |
| 13 | -13 |
| 14 | 1 |
| 15 | 0 |
| 16 | 4 |
| 17 | -80 |
| 18 | 72 |
| 19 | -16 |
| 20 | 1 |
| 21 | 0 |
| 22 | 0 |
| 23 | 95 |
| 24 | -228 |
| 25 | 114 |
| 26 | -19 |
| 27 | 1 |
| 28 | 0 |
| 29 | 0 |
| 30 | -66 |
| 31 | 462 |
| 32 | -484 |
| 33 | 165 |
| 34 | -22 |
| 35 | 1 |
| 36 | 0 |
| 37 | 0 |
| 38 | 25 |
| 39 | -630 |
| 40 | 1375 |
| 41 | -875 |
| 42 | 225 |
| 43 | -25 |
| 44 | 1 |
| 45 | 0 |
| 46 | 0 |
| 47 | -4 |
| 48 | 588 |
| 49 | -2772 |
| 50 | 3185 |
| 51 | -1428 |
| 52 | 294 |
| 53 | -28 |
| 54 | 1 |
| 55 | 0 |
| 56 | 0 |
| 57 | 0 |
| 58 | -372 |
| 59 | 4092 |
| 60 | -8463 |
| 61 | 6324 |
| 62 | -2170 |
| 63 | 372 |