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 | -1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 2 |
| 5 | -1 |
| 6 | -4 |
| 7 | 1 |
| 8 | 7 |
| 9 | 0 |
| 10 | -12 |
| 11 | -3 |
| 12 | 20 |
| 13 | 10 |
| 14 | -32 |
| 15 | -25 |
| 16 | 49 |
| 17 | 55 |
| 18 | -71 |
| 19 | -112 |
| 20 | 95 |
| 21 | 216 |
| 22 | -111 |
| 23 | -399 |
| 24 | 94 |
| 25 | 710 |
| 26 | 11 |
| 27 | -1220 |
| 28 | -316 |
| 29 | 2024 |
| 30 | 1037 |
| 31 | -3233 |
| 32 | -2573 |
| 33 | 4941 |
| 34 | 5634 |
| 35 | -7137 |
| 36 | -11440 |
| 37 | 9505 |
| 38 | 22015 |
| 39 | -11008 |
| 40 | -40592 |
| 41 | 9073 |
| 42 | 72112 |
| 43 | 1934 |
| 44 | -123712 |
| 45 | -33453 |
| 46 | 204897 |
| 47 | 107499 |
| 48 | -326675 |
| 49 | -264664 |
| 50 | 498119 |
| 51 | 577060 |