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 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 1 |
| 5 | -3 |
| 6 | -13 |
| 7 | -19 |
| 8 | -26 |
| 9 | -2 |
| 10 | 115 |
| 11 | 305 |
| 12 | 591 |
| 13 | 615 |
| 14 | -880 |
| 15 | -5150 |
| 16 | -14015 |
| 17 | -23855 |
| 18 | -8895 |
| 19 | 83805 |
| 20 | 350090 |
| 21 | 827190 |
| 22 | 1013985 |
| 23 | -829725 |
| 24 | -8881795 |
| 25 | -28734355 |
| 26 | -54083980 |
| 27 | -32511130 |
| 28 | 207297335 |
| 29 | 1011859275 |
| 30 | 2580294695 |
| 31 | 3555628595 |
| 32 | -2870588790 |
| 33 | -35250085590 |