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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | -1 |
| 7 | -3 |
| 8 | -1 |
| 9 | 3 |
| 10 | 5 |
| 11 | 3 |
| 12 | -5 |
| 13 | -13 |
| 14 | -7 |
| 15 | 13 |
| 16 | 27 |
| 17 | 15 |
| 18 | -25 |
| 19 | -61 |
| 20 | -37 |
| 21 | 57 |
| 22 | 135 |
| 23 | 81 |
| 24 | -119 |
| 25 | -297 |
| 26 | -191 |
| 27 | 257 |
| 28 | 661 |
| 29 | 431 |
| 30 | -549 |
| 31 | -1455 |
| 32 | -991 |
| 33 | 1169 |
| 34 | 3225 |
| 35 | 2257 |
| 36 | -2497 |
| 37 | -7115 |
| 38 | -5145 |
| 39 | 5299 |
| 40 | 15725 |
| 41 | 11715 |
| 42 | -11261 |
| 43 | -34709 |
| 44 | -26623 |
| 45 | 23829 |
| 46 | 76603 |
| 47 | 60479 |
| 48 | -50361 |
| 49 | -168997 |
| 50 | -137173 |
| 51 | 106105 |
| 52 | 372655 |
| 53 | 310905 |
| 54 | -222951 |