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 | 2 |
| 2 | 1 |
| 3 | -10 |
| 4 | -47 |
| 5 | -118 |
| 6 | -143 |
| 7 | 254 |
| 8 | 2017 |
| 9 | 6290 |
| 10 | 11041 |
| 11 | 134 |
| 12 | -76751 |
| 13 | -307942 |
| 14 | -694511 |
| 15 | -622450 |
| 16 | 2371777 |
| 17 | 13844258 |
| 18 | 38774593 |
| 19 | 58188566 |
| 20 | -38667887 |
| 21 | -561991510 |
| 22 | -1977290831 |
| 23 | -3975222754 |
| 24 | -2059855199 |
| 25 | 19587138482 |