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 | 2 |
| 1 | 2 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | -2 |
| 6 | -48 |
| 7 | -70 |
| 8 | 0 |
| 9 | 56 |
| 10 | 308 |
| 11 | 1014 |
| 12 | 798 |
| 13 | -2072 |
| 14 | -5126 |
| 15 | -2820 |
| 16 | 434 |
| 17 | -1340 |
| 18 | 62902 |
| 19 | 398032 |
| 20 | 1247046 |
| 21 | 2834160 |
| 22 | 5266626 |
| 23 | 7862442 |
| 24 | 9510040 |
| 25 | 13829302 |
| 26 | 37650208 |
| 27 | 111410394 |
| 28 | 260524940 |
| 29 | 468110450 |
| 30 | 626899146 |
| 31 | 481007522 |
| 32 | -490911164 |
| 33 | -3217336656 |
| 34 | -8570944960 |