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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | -4 |
| 5 | -32 |
| 6 | -16 |
| 7 | 56 |
| 8 | 80 |
| 9 | 192 |
| 10 | 98 |
| 11 | -740 |
| 12 | -704 |
| 13 | 96 |
| 14 | -224 |
| 15 | 2440 |
| 16 | 3520 |
| 17 | -2624 |
| 18 | -351 |
| 19 | -780 |
| 20 | -10632 |
| 21 | 2688 |
| 22 | 2960 |
| 23 | -9496 |
| 24 | 18176 |
| 25 | 14208 |
| 26 | -3934 |
| 27 | 12552 |
| 28 | -9856 |
| 29 | -24608 |
| 30 | -9760 |
| 31 | -2720 |
| 32 | -25344 |
| 33 | -35520 |
| 34 | 31106 |
| 35 | 34160 |
| 36 | 62844 |
| 37 | 84576 |
| 38 | 3120 |
| 39 | -21880 |
| 40 | -82272 |
| 41 | 27520 |
| 42 | -96768 |
| 43 | -237316 |
| 44 | 130240 |
| 45 | -92832 |
| 46 | 37984 |
| 47 | 305296 |
| 48 | -183296 |
| 49 | 37632 |
| 50 | 208803 |