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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 5 |
| 6 | -1 |
| 7 | 1 |
| 8 | -5 |
| 9 | 11 |
| 10 | -31 |
| 11 | -71 |
| 12 | -211 |
| 13 | -47 |
| 14 | -281 |
| 15 | -22 |
| 16 | -29 |
| 17 | -359 |
| 18 | -569 |
| 19 | -1427 |
| 20 | -1847 |
| 21 | -1427 |
| 22 | -1931 |
| 23 | -18721 |
| 24 | -22681 |
| 25 | -20371 |
| 26 | -24991 |
| 27 | -297163 |
| 28 | -37467 |
| 29 | -34607 |
| 30 | -44617 |
| 31 | -125843 |
| 32 | -4141373 |
| 33 | -3769001 |
| 34 | -2117233 |
| 35 | -327013 |
| 36 | -2117233 |
| 37 | -6041389 |
| 38 | -6662009 |
| 39 | -774568 |
| 40 | -3297757 |