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 | -1 |
| 4 | -1 |
| 5 | -4 |
| 6 | 1 |
| 7 | -1 |
| 8 | 4 |
| 9 | 11 |
| 10 | -1 |
| 11 | 1 |
| 12 | 4 |
| 13 | -21 |
| 14 | -23 |
| 15 | 1 |
| 16 | 1 |
| 17 | -4 |
| 18 | -31 |
| 19 | 60 |
| 20 | 42 |
| 21 | -1 |
| 22 | -1 |
| 23 | -4 |
| 24 | 41 |
| 25 | 100 |
| 26 | -171 |
| 27 | -69 |
| 28 | 1 |
| 29 | -1 |
| 30 | 4 |
| 31 | 51 |
| 32 | -140 |
| 33 | -400 |
| 34 | 381 |
| 35 | 106 |
| 36 | -1 |
| 37 | 1 |
| 38 | 4 |
| 39 | -61 |
| 40 | -180 |
| 41 | 729 |
| 42 | 1060 |
| 43 | -823 |
| 44 | -154 |
| 45 | 1 |
| 46 | 1 |
| 47 | -4 |
| 48 | -71 |
| 49 | 220 |
| 50 | 1158 |
| 51 | -2136 |
| 52 | -3032 |
| 53 | 1561 |
| 54 | 215 |
| 55 | -1 |
| 56 | -1 |
| 57 | -4 |
| 58 | 81 |
| 59 | 260 |
| 60 | -1687 |
| 61 | -3612 |
| 62 | 7721 |
| 63 | 6887 |
| 64 | -2874 |
| 65 | -290 |
| 66 | 1 |
| 67 | -1 |
| 68 | 4 |
| 69 | 91 |
| 70 | -300 |
| 71 | -2316 |