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 | -6 |
| 2 | 9 |
| 3 | 10 |
| 4 | -30 |
| 5 | 0 |
| 6 | 11 |
| 7 | 42 |
| 8 | 0 |
| 9 | -70 |
| 10 | 18 |
| 11 | -54 |
| 12 | 49 |
| 13 | 90 |
| 14 | 0 |
| 15 | -22 |
| 16 | -60 |
| 17 | 0 |
| 18 | -110 |
| 19 | 0 |
| 20 | 81 |
| 21 | 180 |
| 22 | -78 |
| 23 | 0 |
| 24 | 130 |
| 25 | -198 |
| 26 | 0 |
| 27 | -182 |
| 28 | -30 |
| 29 | 90 |
| 30 | 121 |
| 31 | 84 |
| 32 | 0 |
| 33 | 0 |
| 34 | 210 |
| 35 | 0 |
| 36 | -252 |
| 37 | -102 |
| 38 | -270 |
| 39 | 170 |
| 40 | 0 |
| 41 | 0 |
| 42 | -69 |
| 43 | 330 |
| 44 | 0 |
| 45 | -38 |
| 46 | 420 |
| 47 | 0 |
| 48 | -190 |
| 49 | -390 |
| 50 | 0 |
| 51 | -108 |
| 52 | 0 |
| 53 | 0 |
| 54 | 0 |
| 55 | -300 |
| 56 | 99 |
| 57 | 442 |
| 58 | 210 |
| 59 | 0 |
| 60 | 418 |
| 61 | -294 |
| 62 | 0 |
| 63 | 0 |
| 64 | -510 |
| 65 | 378 |
| 66 | -540 |
| 67 | 138 |
| 68 | 0 |