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 | 3 |
| 2 | -383 |
| 3 | -3501 |
| 4 | 439905 |
| 5 | 6809283 |
| 6 | -841785951 |
| 7 | -18540791469 |
| 8 | 2254238275137 |
| 9 | 64906636872195 |
| 10 | -7758232724066751 |
| 11 | -277708714711204653 |
| 12 | 32620373362042216353 |
| 13 | 1404202914087633336771 |
| 14 | -162020813910704234524575 |
| 15 | -8192328034245044455772973 |
| 16 | 928105401692205765637182081 |