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 | -2 |
| 3 | -2 |
| 4 | -3 |
| 5 | -1 |
| 6 | -2 |
| 7 | 6 |
| 8 | 12 |
| 9 | 36 |
| 10 | 74 |
| 11 | 162 |
| 12 | 301 |
| 13 | 599 |
| 14 | 1090 |
| 15 | 1986 |
| 16 | 3479 |
| 17 | 5993 |
| 18 | 9852 |
| 19 | 15644 |
| 20 | 23094 |
| 21 | 30690 |
| 22 | 31868 |
| 23 | 9068 |
| 24 | -82372 |
| 25 | -345308 |
| 26 | -1010956 |
| 27 | -2577868 |
| 28 | -6098822 |
| 29 | -13751218 |
| 30 | -29962588 |
| 31 | -63604140 |
| 32 | -132205949 |
| 33 | -269982371 |
| 34 | -542866266 |
| 35 | -1076420666 |