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 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 1 |
| 7 | 17 |
| 8 | -7 |
| 9 | 1 |
| 10 | 1 |
| 11 | 181 |
| 12 | -167 |
| 13 | 77 |
| 14 | -5 |
| 15 | 1 |
| 16 | 5197 |
| 17 | -613 |
| 18 | 581 |
| 19 | -187 |
| 20 | 7 |
| 21 | 1 |
| 22 | 4129 |
| 23 | -60239 |
| 24 | 5573 |
| 25 | -9877 |
| 26 | 1597 |
| 27 | -37 |
| 28 | 1 |
| 29 | 203851 |
| 30 | -304867 |
| 31 | 600941 |
| 32 | -10489 |
| 33 | 477 |
| 34 | -1907 |
| 35 | 17 |
| 36 | 1 |
| 37 | 25440983 |
| 38 | -65392379 |
| 39 | 25933147 |
| 40 | -277639 |
| 41 | 91781 |
| 42 | 3029 |
| 43 | -40199 |
| 44 | 887 |
| 45 | 1 |
| 46 | 655434541 |
| 47 | -3777574277 |
| 48 | 11384809949 |
| 49 | -12459371 |
| 50 | -12541363 |
| 51 | 531383 |
| 52 | -6199573 |
| 53 | 505481 |
| 54 | -281 |