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 | 0 |
| 2 | -1 |
| 3 | -3 |
| 4 | -2 |
| 5 | 3 |
| 6 | 11 |
| 7 | 12 |
| 8 | -5 |
| 9 | -39 |
| 10 | -58 |
| 11 | -9 |
| 12 | 127 |
| 13 | 252 |
| 14 | 143 |
| 15 | -363 |
| 16 | -1010 |
| 17 | -933 |
| 18 | 803 |
| 19 | 3756 |
| 20 | 4819 |
| 21 | -543 |
| 22 | -12874 |
| 23 | -21969 |
| 24 | -8009 |
| 25 | 39708 |
| 26 | 91655 |
| 27 | 67965 |
| 28 | -103106 |
| 29 | -354381 |
| 30 | -387205 |
| 31 | 173388 |
| 32 | 1269355 |
| 33 | 1870377 |
| 34 | 254246 |
| 35 | -4154841 |
| 36 | -8149841 |
| 37 | -4503492 |
| 38 | 11956031 |
| 39 | 32759205 |
| 40 | 29810158 |
| 41 | -26861109 |