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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | -2 |
| 8 | -5 |
| 9 | -12 |
| 10 | -25 |
| 11 | -50 |
| 12 | -96 |
| 13 | -180 |
| 14 | -331 |
| 15 | -600 |
| 16 | -1075 |
| 17 | -1908 |
| 18 | -3360 |
| 19 | -5878 |
| 20 | -10225 |
| 21 | -17700 |
| 22 | -30509 |
| 23 | -52390 |
| 24 | -89664 |
| 25 | -153000 |
| 26 | -260375 |
| 27 | -442032 |
| 28 | -748775 |
| 29 | -1265832 |
| 30 | -2136000 |
| 31 | -3598250 |
| 32 | -6052061 |
| 33 | -10164540 |