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 | 0 |
| 1 | 1 |
| 2 | -3 |
| 3 | 0 |
| 4 | 9 |
| 5 | 14 |
| 6 | 0 |
| 7 | 7 |
| 8 | -27 |
| 9 | -18 |
| 10 | -42 |
| 11 | -31 |
| 12 | 0 |
| 13 | 13 |
| 14 | -21 |
| 15 | -6 |
| 16 | 81 |
| 17 | 98 |
| 18 | 54 |
| 19 | 73 |
| 20 | 126 |
| 21 | 147 |
| 22 | 93 |
| 23 | 116 |
| 24 | 0 |
| 25 | 25 |
| 26 | -39 |
| 27 | -12 |
| 28 | 63 |
| 29 | 92 |
| 30 | 18 |
| 31 | 49 |
| 32 | -243 |
| 33 | -210 |
| 34 | -294 |
| 35 | -259 |
| 36 | -162 |
| 37 | -125 |
| 38 | -219 |
| 39 | -180 |
| 40 | -378 |
| 41 | -337 |
| 42 | -441 |
| 43 | -398 |
| 44 | -279 |
| 45 | -234 |
| 46 | -348 |
| 47 | -301 |
| 48 | 0 |
| 49 | 49 |
| 50 | -75 |
| 51 | -24 |
| 52 | 117 |
| 53 | 170 |
| 54 | 36 |
| 55 | 91 |
| 56 | -189 |
| 57 | -132 |
| 58 | -276 |
| 59 | -217 |
| 60 | -54 |
| 61 | 7 |
| 62 | -147 |
| 63 | -84 |
| 64 | 729 |
| 65 | 794 |
| 66 | 630 |