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 | -2 |
| 2 | 3 |
| 3 | -4 |
| 4 | 3 |
| 5 | 0 |
| 6 | -5 |
| 7 | 12 |
| 8 | -18 |
| 9 | 18 |
| 10 | -9 |
| 11 | -12 |
| 12 | 44 |
| 13 | -76 |
| 14 | 93 |
| 15 | -76 |
| 16 | 5 |
| 17 | 120 |
| 18 | -273 |
| 19 | 400 |
| 20 | -414 |
| 21 | 228 |
| 22 | 200 |
| 23 | -828 |
| 24 | 1480 |
| 25 | -1842 |
| 26 | 1539 |
| 27 | -268 |
| 28 | -2004 |
| 29 | 4824 |
| 30 | -7168 |
| 31 | 7568 |
| 32 | -4518 |
| 33 | -2784 |
| 34 | 13577 |
| 35 | -24900 |
| 36 | 31563 |
| 37 | -27236 |
| 38 | 6816 |
| 39 | 30308 |
| 40 | -77010 |
| 41 | 116844 |
| 42 | -126018 |
| 43 | 80180 |
| 44 | 34140 |
| 45 | -205932 |
| 46 | 389275 |