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 | 2 |
| 3 | -1 |
| 4 | 1 |
| 5 | 2 |
| 6 | -3 |
| 7 | 7 |
| 8 | -6 |
| 9 | 7 |
| 10 | 1 |
| 11 | -6 |
| 12 | 21 |
| 13 | -25 |
| 14 | 34 |
| 15 | -17 |
| 16 | 1 |
| 17 | 50 |
| 18 | -83 |
| 19 | 135 |
| 20 | -118 |
| 21 | 87 |
| 22 | 65 |
| 23 | -214 |
| 24 | 453 |
| 25 | -537 |
| 26 | 562 |
| 27 | -193 |
| 28 | -319 |
| 29 | 1250 |
| 30 | -1955 |
| 31 | 2567 |
| 32 | -2022 |
| 33 | 679 |
| 34 | 2433 |
| 35 | -5798 |
| 36 | 9589 |
| 37 | -10521 |
| 38 | 8514 |
| 39 | 143 |
| 40 | -12671 |
| 41 | 29842 |
| 42 | -42227 |
| 43 | 46727 |
| 44 | -29270 |
| 45 | -8457 |
| 46 | 72641 |
| 47 | -139638 |
| 48 | 195365 |
| 49 | -189721 |
| 50 | 105810 |
| 51 | 95199 |
| 52 | -368831 |