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 | -3 |
| 4 | 3 |
| 5 | -1 |
| 6 | 5 |
| 7 | -1 |
| 8 | 19 |
| 9 | -12 |
| 10 | 7 |
| 11 | -33 |
| 12 | 34 |
| 13 | -64 |
| 14 | 22 |
| 15 | -106 |
| 16 | 150 |
| 17 | -148 |
| 18 | 203 |
| 19 | -230 |
| 20 | 534 |
| 21 | -411 |
| 22 | 626 |
| 23 | -806 |
| 24 | 1385 |
| 25 | -1566 |
| 26 | 1503 |
| 27 | -2850 |
| 28 | 3313 |
| 29 | -4691 |
| 30 | 4430 |
| 31 | -7459 |
| 32 | 9799 |
| 33 | -11676 |
| 34 | 13897 |
| 35 | -18173 |
| 36 | 27345 |
| 37 | -28847 |
| 38 | 38230 |
| 39 | -47015 |
| 40 | 68659 |
| 41 | -76681 |
| 42 | 94256 |
| 43 | -124803 |
| 44 | 161835 |
| 45 | -200269 |