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 | 0 |
| 4 | 0 |
| 5 | -1 |
| 6 | 0 |
| 7 | -1 |
| 8 | 1 |
| 9 | -1 |
| 10 | 2 |
| 11 | -2 |
| 12 | 3 |
| 13 | -4 |
| 14 | 5 |
| 15 | -7 |
| 16 | 9 |
| 17 | -12 |
| 18 | 16 |
| 19 | -21 |
| 20 | 28 |
| 21 | -37 |
| 22 | 49 |
| 23 | -65 |
| 24 | 86 |
| 25 | -114 |
| 26 | 151 |
| 27 | -200 |
| 28 | 265 |
| 29 | -351 |
| 30 | 465 |
| 31 | -616 |
| 32 | 816 |
| 33 | -1081 |
| 34 | 1432 |
| 35 | -1897 |
| 36 | 2513 |
| 37 | -3329 |
| 38 | 4410 |
| 39 | -5842 |
| 40 | 7739 |
| 41 | -10252 |
| 42 | 13581 |
| 43 | -17991 |
| 44 | 23833 |
| 45 | -31572 |
| 46 | 41824 |
| 47 | -55405 |
| 48 | 73396 |
| 49 | -97229 |
| 50 | 128801 |