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 | -10 |
| 2 | 46 |
| 3 | -334 |
| 4 | 982 |
| 5 | -10942 |
| 6 | 140986 |
| 7 | -425730 |
| 8 | 7201374 |
| 9 | -137366646 |
| 10 | 410787198 |
| 11 | -9473047614 |
| 12 | 236302407090 |
| 13 | -710245778490 |
| 14 | 20563663645710 |
| 15 | -638377099140510 |
| 16 | 1912749274005030 |
| 17 | -67020067316087550 |
| 18 | 2477305680740159850 |