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 | 10 |
| 2 | -782 |
| 3 | -25460 |
| 4 | 1814572 |
| 5 | 107968600 |
| 6 | -6922576520 |
| 7 | -640595596400 |
| 8 | 36334031470480 |
| 9 | 4883382842903200 |
| 10 | -239585713383638240 |
| 11 | -45467293808242606400 |
| 12 | 1869787653165632140480 |
| 13 | 499923714198096067542400 |
| 14 | -16439748089216177447319680 |
| 15 | -6337455503810252016486752000 |