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 | 5 |
| 2 | -92 |
| 3 | -1971 |
| 4 | -15088 |
| 5 | -70349 |
| 6 | -233280 |
| 7 | -543607 |
| 8 | -417536 |
| 9 | 5294727 |
| 10 | 50466176 |
| 11 | 343309885 |
| 12 | 2140950528 |
| 13 | 12997945499 |
| 14 | 78258750592 |
| 15 | 470014125201 |
| 16 | 2820841472000 |
| 17 | 16926249106063 |
| 18 | 101559344448384 |
| 19 | 609358846138757 |