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 | -2 |
| 3 | 1 |
| 4 | 4 |
| 5 | -8 |
| 6 | 8 |
| 7 | -4 |
| 8 | 1 |
| 9 | 8 |
| 10 | -24 |
| 11 | 36 |
| 12 | -32 |
| 13 | 18 |
| 14 | -6 |
| 15 | 1 |
| 16 | 16 |
| 17 | -64 |
| 18 | 128 |
| 19 | -160 |
| 20 | 136 |
| 21 | -80 |
| 22 | 32 |
| 23 | -8 |
| 24 | 1 |
| 25 | 32 |
| 26 | -160 |
| 27 | 400 |
| 28 | -640 |
| 29 | 720 |
| 30 | -592 |
| 31 | 360 |
| 32 | -160 |
| 33 | 50 |
| 34 | -10 |
| 35 | 1 |
| 36 | 64 |
| 37 | -384 |
| 38 | 1152 |
| 39 | -2240 |
| 40 | 3120 |
| 41 | -3264 |
| 42 | 2624 |
| 43 | -1632 |
| 44 | 780 |
| 45 | -280 |
| 46 | 72 |
| 47 | -12 |
| 48 | 1 |
| 49 | 128 |
| 50 | -896 |
| 51 | 3136 |
| 52 | -7168 |
| 53 | 11872 |
| 54 | -15008 |
| 55 | 14896 |
| 56 | -11776 |
| 57 | 7448 |
| 58 | -3752 |
| 59 | 1484 |
| 60 | -448 |
| 61 | 98 |
| 62 | -14 |
| 63 | 1 |