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 | 1 |
| 5 | 0 |
| 6 | -1 |
| 7 | -2 |
| 8 | -3 |
| 9 | -4 |
| 10 | -3 |
| 11 | 0 |
| 12 | 5 |
| 13 | 12 |
| 14 | 21 |
| 15 | 26 |
| 16 | 21 |
| 17 | 0 |
| 18 | -43 |
| 19 | -114 |
| 20 | -195 |
| 21 | -244 |
| 22 | -195 |
| 23 | 42 |
| 24 | 581 |
| 25 | 1440 |
| 26 | 2421 |
| 27 | 2990 |
| 28 | 2157 |
| 29 | -1644 |
| 30 | -9955 |
| 31 | -22974 |
| 32 | -37515 |
| 33 | -44248 |
| 34 | -24219 |
| 35 | 50310 |
| 36 | 205661 |
| 37 | 442140 |
| 38 | 689997 |
| 39 | 740906 |
| 40 | 190245 |
| 41 | -1534224 |
| 42 | -4941355 |
| 43 | -9887058 |
| 44 | -14429619 |
| 45 | -13255900 |
| 46 | 3510141 |