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 | 18 |
| 2 | -1598 |
| 3 | -97956 |
| 4 | 7450860 |
| 5 | 887201208 |
| 6 | -55633142856 |
| 7 | -11232600902064 |
| 8 | 546301487747472 |
| 9 | 182545898249590560 |
| 10 | -6164096966563140576 |
| 11 | -3619485909755267093568 |
| 12 | 65170591691483110373568 |
| 13 | 84652893673042176232776576 |
| 14 | -104600317888637823603991680 |