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 | 0 |
| 2 | -1 |
| 3 | -2 |
| 4 | -3 |
| 5 | -6 |
| 6 | -4 |
| 7 | -10 |
| 8 | -13 |
| 9 | -26 |
| 10 | -14 |
| 11 | -183 |
| 12 | -15 |
| 13 | -22 |
| 14 | -57 |
| 15 | -210 |
| 16 | -211 |
| 17 | -1730 |
| 18 | -58 |
| 19 | 25160 |
| 20 | -240 |
| 21 | -3356 |
| 22 | -949 |
| 23 | 238031 |
| 24 | -241 |
| 25 | -256823 |
| 26 | -3918 |
| 27 | -143243 |
| 28 | -3919 |
| 29 | 46326924 |
| 30 | -242 |
| 31 | 281620682 |
| 32 | -61817 |
| 33 | -639769 |
| 34 | -61818 |
| 35 | -4718174 |
| 36 | -4415 |
| 37 | 2023569890 |
| 38 | -224436 |
| 39 | -7556927 |
| 40 | -63639 |
| 41 | -43279525745 |
| 42 | -4416 |