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 | -6 |
| 5 | 1 |
| 6 | 1 |
| 7 | -14 |
| 8 | 1 |
| 9 | 1 |
| 10 | -28 |
| 11 | 70 |
| 12 | -28 |
| 13 | 1 |
| 14 | 1 |
| 15 | -44 |
| 16 | 166 |
| 17 | -44 |
| 18 | 1 |
| 19 | 1 |
| 20 | -60 |
| 21 | 134 |
| 22 | -60 |
| 23 | 1 |
| 24 | 1 |
| 25 | -90 |
| 26 | 911 |
| 27 | -2092 |
| 28 | 911 |
| 29 | -90 |
| 30 | 1 |
| 31 | 1 |
| 32 | -120 |
| 33 | 1820 |
| 34 | -8008 |
| 35 | 12870 |
| 36 | -8008 |
| 37 | 1820 |
| 38 | -120 |
| 39 | 1 |
| 40 | 1 |
| 41 | -138 |
| 42 | 975 |
| 43 | -1868 |
| 44 | 975 |
| 45 | -138 |
| 46 | 1 |
| 47 | 1 |
| 48 | -184 |
| 49 | 3740 |
| 50 | -16136 |
| 51 | 25414 |
| 52 | -16136 |
| 53 | 3740 |
| 54 | -184 |
| 55 | 1 |
| 56 | 1 |
| 57 | -230 |
| 58 | 7085 |
| 59 | -67528 |
| 60 | 252242 |
| 61 | -394404 |
| 62 | 252242 |
| 63 | -67528 |
| 64 | 7085 |
| 65 | -230 |
| 66 | 1 |
| 67 | 1 |
| 68 | -248 |
| 69 | 3612 |
| 70 | -16072 |
| 71 | 25670 |
| 72 | -16072 |
| 73 | 3612 |
| 74 | -248 |
| 75 | 1 |