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 | 3 |
| 4 | -4 |
| 5 | 1 |
| 6 | -9 |
| 7 | 15 |
| 8 | -7 |
| 9 | 1 |
| 10 | 31 |
| 11 | -58 |
| 12 | 36 |
| 13 | -10 |
| 14 | 1 |
| 15 | -113 |
| 16 | 229 |
| 17 | -170 |
| 18 | 66 |
| 19 | -13 |
| 20 | 1 |
| 21 | 431 |
| 22 | -924 |
| 23 | 775 |
| 24 | -372 |
| 25 | 105 |
| 26 | -16 |
| 27 | 1 |
| 28 | -1697 |
| 29 | 3795 |
| 30 | -3481 |
| 31 | 1939 |
| 32 | -691 |
| 33 | 153 |
| 34 | -19 |
| 35 | 1 |
| 36 | 6847 |
| 37 | -15822 |
| 38 | 15542 |
| 39 | -9674 |
| 40 | 4072 |
| 41 | -1154 |
| 42 | 210 |
| 43 | -22 |
| 44 | 1 |
| 45 | -28161 |
| 46 | 66801 |
| 47 | -69276 |
| 48 | 47012 |
| 49 | -22446 |
| 50 | 7606 |
| 51 | -1788 |
| 52 | 276 |
| 53 | -25 |
| 54 | 1 |