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 | 2 |
| 2 | -1 |
| 3 | 4 |
| 4 | -1 |
| 5 | 6 |
| 6 | -6 |
| 7 | 8 |
| 8 | 2 |
| 9 | 12 |
| 10 | -15 |
| 11 | 12 |
| 12 | 8 |
| 13 | 14 |
| 14 | -28 |
| 15 | 32 |
| 16 | 22 |
| 17 | 18 |
| 18 | -55 |
| 19 | 20 |
| 20 | 34 |
| 21 | 72 |
| 22 | -66 |
| 23 | 24 |
| 24 | 44 |
| 25 | 28 |
| 26 | -91 |
| 27 | 140 |
| 28 | 62 |
| 29 | 30 |
| 30 | -205 |
| 31 | 32 |
| 32 | 209 |
| 33 | 244 |
| 34 | -153 |
| 35 | 72 |
| 36 | -98 |
| 37 | 38 |
| 38 | -190 |
| 39 | 392 |
| 40 | 443 |
| 41 | 42 |
| 42 | -518 |
| 43 | 44 |
| 44 | -1 |
| 45 | 788 |
| 46 | -276 |
| 47 | 48 |
| 48 | 506 |
| 49 | 52 |
| 50 | -451 |
| 51 | 852 |
| 52 | -196 |
| 53 | 54 |
| 54 | -1086 |
| 55 | 728 |
| 56 | 1636 |
| 57 | 1180 |
| 58 | -435 |
| 59 | 60 |
| 60 | -1691 |