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 | -8 |
| 2 | 20 |
| 3 | 0 |
| 4 | -70 |
| 5 | 64 |
| 6 | 56 |
| 7 | 0 |
| 8 | -133 |
| 9 | -96 |
| 10 | 148 |
| 11 | 0 |
| 12 | 670 |
| 13 | -512 |
| 14 | -968 |
| 15 | 0 |
| 16 | 1077 |
| 17 | 1680 |
| 18 | -2064 |
| 19 | 0 |
| 20 | -2098 |
| 21 | 768 |
| 22 | 4400 |
| 23 | 0 |
| 24 | -1766 |
| 25 | -8128 |
| 26 | 7044 |
| 27 | 0 |
| 28 | 744 |
| 29 | 4096 |
| 30 | -4760 |
| 31 | 0 |
| 32 | -9780 |
| 33 | 16344 |
| 34 | -6652 |
| 35 | 0 |
| 36 | 7894 |
| 37 | -13440 |
| 38 | -10320 |
| 39 | 0 |
| 40 | 41923 |
| 41 | -8736 |
| 42 | -16780 |
| 43 | 0 |
| 44 | -5892 |
| 45 | -6144 |
| 46 | 14560 |
| 47 | 0 |
| 48 | -27886 |
| 49 | -11056 |
| 50 | 55940 |