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 | 4 |
| 2 | -1906 |
| 3 | -23000 |
| 4 | 10897996 |
| 5 | 220415984 |
| 6 | -103848077624 |
| 7 | -2957229437984 |
| 8 | 1385343118601360 |
| 9 | 51011732312847424 |
| 10 | -23759618336314935584 |
| 11 | -1075483968398187231616 |
| 12 | 498023914992777619190464 |
| 13 | 26797057907106900786753280 |
| 14 | -12336437308381113989945920384 |