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 | -12 |
| 2 | -16 |
| 3 | -294 |
| 4 | -1552 |
| 5 | -11868 |
| 6 | -78142 |
| 7 | -543996 |
| 8 | -3706624 |
| 9 | -25463142 |
| 10 | -174376288 |
| 11 | -1195587372 |
| 12 | -8193644926 |
| 13 | -56162781804 |
| 14 | -384938354032 |
| 15 | -2638425262758 |
| 16 | -18083987259952 |
| 17 | -123949619666556 |
| 18 | -849562999302334 |
| 19 | -5822992294650972 |
| 20 | -39911380656754528 |