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 | -3 |
| 2 | -4 |
| 3 | 6 |
| 4 | -5 |
| 5 | 22 |
| 6 | -30 |
| 7 | -6 |
| 8 | 36 |
| 9 | 16 |
| 10 | -168 |
| 11 | 192 |
| 12 | -7 |
| 13 | 54 |
| 14 | 46 |
| 15 | -294 |
| 16 | -266 |
| 17 | 1428 |
| 18 | -1386 |
| 19 | -8 |
| 20 | 76 |
| 21 | 64 |
| 22 | -480 |
| 23 | 30 |
| 24 | -832 |
| 25 | 2560 |
| 26 | -128 |
| 27 | 3520 |
| 28 | -12800 |
| 29 | 10752 |
| 30 | -9 |
| 31 | 102 |
| 32 | 86 |
| 33 | -738 |
| 34 | 78 |
| 35 | -1260 |
| 36 | 4356 |
| 37 | -594 |
| 38 | -558 |
| 39 | 11484 |
| 40 | -23166 |
| 41 | 3564 |
| 42 | -42900 |
| 43 | 118404 |
| 44 | -87516 |
| 45 | -10 |
| 46 | 132 |
| 47 | 112 |
| 48 | -1080 |
| 49 | 100 |
| 50 | -1840 |
| 51 | 7040 |
| 52 | 48 |
| 53 | -1680 |
| 54 | -800 |
| 55 | 18240 |
| 56 | -40320 |
| 57 | -760 |
| 58 | 8640 |