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 | -2 |
| 2 | 1 |
| 3 | 5 |
| 4 | -4 |
| 5 | 1 |
| 6 | -15 |
| 7 | 15 |
| 8 | -6 |
| 9 | 1 |
| 10 | 52 |
| 11 | -60 |
| 12 | 30 |
| 13 | -8 |
| 14 | 1 |
| 15 | -203 |
| 16 | 260 |
| 17 | -150 |
| 18 | 50 |
| 19 | -10 |
| 20 | 1 |
| 21 | 877 |
| 22 | -1218 |
| 23 | 780 |
| 24 | -300 |
| 25 | 75 |
| 26 | -12 |
| 27 | 1 |
| 28 | -4140 |
| 29 | 6139 |
| 30 | -4263 |
| 31 | 1820 |
| 32 | -525 |
| 33 | 105 |
| 34 | -14 |
| 35 | 1 |
| 36 | 21147 |
| 37 | -33120 |
| 38 | 24556 |
| 39 | -11368 |
| 40 | 3640 |
| 41 | -840 |
| 42 | 140 |
| 43 | -16 |
| 44 | 1 |
| 45 | -115975 |
| 46 | 190323 |
| 47 | -149040 |
| 48 | 73668 |
| 49 | -25578 |
| 50 | 6552 |
| 51 | -1260 |
| 52 | 180 |
| 53 | -18 |
| 54 | 1 |