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 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 4 |
| 7 | 4 |
| 8 | 6 |
| 9 | 6 |
| 10 | 9 |
| 11 | 9 |
| 12 | 13 |
| 13 | 12 |
| 14 | 16 |
| 15 | 15 |
| 16 | 18 |
| 17 | 15 |
| 18 | 18 |
| 19 | 12 |
| 20 | 12 |
| 21 | 2 |
| 22 | -3 |
| 23 | -20 |
| 24 | -31 |
| 25 | -59 |
| 26 | -81 |
| 27 | -122 |
| 28 | -160 |
| 29 | -222 |
| 30 | -280 |
| 31 | -369 |
| 32 | -457 |
| 33 | -581 |
| 34 | -708 |
| 35 | -878 |
| 36 | -1055 |
| 37 | -1286 |
| 38 | -1528 |
| 39 | -1833 |
| 40 | -2158 |
| 41 | -2559 |
| 42 | -2985 |
| 43 | -3504 |
| 44 | -4059 |
| 45 | -4721 |
| 46 | -5433 |
| 47 | -6271 |
| 48 | -7172 |
| 49 | -8224 |
| 50 | -9355 |
| 51 | -10660 |
| 52 | -12067 |