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 | 4 |
| 3 | 7 |
| 4 | 8 |
| 5 | -7 |
| 6 | -74 |
| 7 | -209 |
| 8 | -40 |
| 9 | 2441 |
| 10 | 10954 |
| 11 | 6667 |
| 12 | -185524 |
| 13 | -1041739 |
| 14 | -510530 |
| 15 | 26716831 |
| 16 | 158378768 |
| 17 | -47260303 |
| 18 | -6226501934 |
| 19 | -34323431789 |
| 20 | 71521515284 |
| 21 | 2087815263725 |
| 22 | 9437342779558 |
| 23 | -55046954388953 |
| 24 | -923175950185960 |
| 25 | -2736047549718871 |
| 26 | 43387645616657338 |