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 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -1 |
| 6 | 0 |
| 7 | 2 |
| 8 | -1 |
| 9 | -2 |
| 10 | 1 |
| 11 | 3 |
| 12 | -3 |
| 13 | -1 |
| 14 | 3 |
| 15 | 1 |
| 16 | -7 |
| 17 | 3 |
| 18 | 7 |
| 19 | -2 |
| 20 | -12 |
| 21 | 10 |
| 22 | 5 |
| 23 | -10 |
| 24 | -8 |
| 25 | 27 |
| 26 | -8 |
| 27 | -23 |
| 28 | 2 |
| 29 | 46 |
| 30 | -38 |
| 31 | -20 |
| 32 | 30 |
| 33 | 45 |
| 34 | -100 |
| 35 | 27 |
| 36 | 71 |
| 37 | 12 |
| 38 | -183 |
| 39 | 141 |
| 40 | 65 |
| 41 | -71 |
| 42 | -213 |
| 43 | 384 |
| 44 | -100 |
| 45 | -202 |
| 46 | -145 |
| 47 | 729 |
| 48 | -545 |
| 49 | -172 |
| 50 | 93 |
| 51 | 993 |
| 52 | -1497 |
| 53 | 430 |
| 54 | 452 |
| 55 | 962 |
| 56 | -2982 |
| 57 | 2188 |
| 58 | 250 |
| 59 | 451 |
| 60 | -4527 |
| 61 | 6014 |
| 62 | -2119 |
| 63 | -296 |
| 64 | -5456 |
| 65 | 12440 |
| 66 | -9197 |
| 67 | 1206 |
| 68 | -5307 |
| 69 | 20547 |
| 70 | -24963 |
| 71 | 11156 |
| 72 | -5513 |
| 73 | 28712 |
| 74 | -53013 |
| 75 | 40590 |
| 76 | -15529 |
| 77 | 36553 |
| 78 | -93599 |
| 79 | 107065 |
| 80 | -60129 |
| 81 | 52093 |
| 82 | -145383 |
| 83 | 231326 |
| 84 | -186656 |
| 85 | 113800 |
| 86 | -214705 |
| 87 | 429584 |
| 88 | -474454 |
| 89 | 323536 |