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 | -2 |
| 5 | 1 |
| 6 | 4 |
| 7 | 13 |
| 8 | 22 |
| 9 | 36 |
| 10 | 47 |
| 11 | 54 |
| 12 | 37 |
| 13 | -11 |
| 14 | -129 |
| 15 | -346 |
| 16 | -709 |
| 17 | -1257 |
| 18 | -2023 |
| 19 | -2979 |
| 20 | -4014 |
| 21 | -4836 |
| 22 | -4851 |
| 23 | -3041 |
| 24 | 2310 |
| 25 | 13785 |
| 26 | 35186 |
| 27 | 71598 |
| 28 | 129624 |
| 29 | 216732 |
| 30 | 340488 |
| 31 | 505769 |
| 32 | 710775 |
| 33 | 938823 |
| 34 | 1146714 |
| 35 | 1244936 |
| 36 | 1070745 |
| 37 | 347604 |
| 38 | -1366923 |
| 39 | -4751316 |