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 | -4 |
| 2 | 2 |
| 3 | 8 |
| 4 | -1 |
| 5 | -20 |
| 6 | -2 |
| 7 | 40 |
| 8 | 3 |
| 9 | -72 |
| 10 | 2 |
| 11 | 128 |
| 12 | -4 |
| 13 | -220 |
| 14 | -4 |
| 15 | 360 |
| 16 | 5 |
| 17 | -576 |
| 18 | 8 |
| 19 | 904 |
| 20 | -8 |
| 21 | -1384 |
| 22 | -10 |
| 23 | 2088 |
| 24 | 11 |
| 25 | -3108 |
| 26 | 12 |
| 27 | 4552 |
| 28 | -15 |
| 29 | -6592 |
| 30 | -18 |
| 31 | 9448 |
| 32 | 22 |
| 33 | -13392 |
| 34 | 26 |
| 35 | 18816 |
| 36 | -29 |
| 37 | -26216 |
| 38 | -34 |
| 39 | 36224 |
| 40 | 38 |
| 41 | -49700 |
| 42 | 42 |
| 43 | 67728 |
| 44 | -51 |
| 45 | -91688 |
| 46 | -56 |
| 47 | 123392 |
| 48 | 66 |
| 49 | -165128 |
| 50 | 78 |
| 51 | 219784 |
| 52 | -85 |
| 53 | -291072 |