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 | 1 |
| 2 | -3 |
| 3 | -47 |
| 4 | 1385 |
| 5 | 119601 |
| 6 | -22345691 |
| 7 | -10181013695 |
| 8 | 10346973518097 |
| 9 | 23934447308323873 |
| 10 | -122307331801326167539 |
| 11 | -1379021793666951568998159 |
| 12 | 33874331587448813081748999673 |
| 13 | 1804181313330860398948564389193681 |
| 14 | -206892703326367302570264123699846971211 |