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 | 0 |
| 2 | -1 |
| 3 | 2 |
| 4 | 1 |
| 5 | -4 |
| 6 | 3 |
| 7 | 6 |
| 8 | -11 |
| 9 | 0 |
| 10 | 23 |
| 11 | -22 |
| 12 | -23 |
| 13 | 68 |
| 14 | -21 |
| 15 | -114 |
| 16 | 157 |
| 17 | 72 |
| 18 | -385 |
| 19 | 242 |
| 20 | 529 |
| 21 | -1012 |
| 22 | -45 |
| 23 | 2070 |
| 24 | -1979 |
| 25 | -2160 |
| 26 | 6119 |
| 27 | -1798 |
| 28 | -10439 |
| 29 | 14036 |
| 30 | 6843 |
| 31 | -34914 |
| 32 | 21229 |
| 33 | 48600 |
| 34 | -91057 |
| 35 | -6142 |
| 36 | 188257 |
| 37 | -175972 |
| 38 | -200541 |
| 39 | 552486 |
| 40 | -151403 |
| 41 | -953568 |
| 42 | 1256375 |
| 43 | 650762 |
| 44 | -3163511 |
| 45 | 1861988 |
| 46 | 4465035 |