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 | 26 |
| 2 | -46 |
| 3 | -38740 |
| 4 | -907604 |
| 5 | 88283416 |
| 6 | 5571819256 |
| 7 | -237576457456 |
| 8 | -34336962413680 |
| 9 | 479480595510176 |
| 10 | 235588077247357216 |
| 11 | 2663440108847816896 |
| 12 | -1801791066668467770176 |
| 13 | -69922612836437647611520 |
| 14 | 15093623018002859652972416 |
| 15 | 1099211969018786093034526976 |