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 | 20 |
| 2 | -70 |
| 3 | 56 |
| 4 | -125 |
| 5 | 308 |
| 6 | 110 |
| 7 | -520 |
| 8 | 57 |
| 9 | 0 |
| 10 | 182 |
| 11 | -880 |
| 12 | 1190 |
| 13 | 884 |
| 14 | 0 |
| 15 | -1400 |
| 16 | -1330 |
| 17 | 1820 |
| 18 | -646 |
| 19 | 0 |
| 20 | -1331 |
| 21 | 380 |
| 22 | 1120 |
| 23 | 2576 |
| 24 | 0 |
| 25 | 1748 |
| 26 | -3850 |
| 27 | -3400 |
| 28 | 2703 |
| 29 | -2500 |
| 30 | 3458 |
| 31 | 0 |
| 32 | -1150 |
| 33 | -5236 |
| 34 | 0 |
| 35 | 6032 |
| 36 | 6160 |
| 37 | -3220 |
| 38 | 4466 |
| 39 | 0 |
| 40 | -7378 |
| 41 | -3920 |
| 42 | 0 |
| 43 | 2200 |
| 44 | 0 |
| 45 | 812 |
| 46 | -4030 |
| 47 | 5600 |
| 48 | -4913 |