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 | 6 |
| 2 | -206 |
| 3 | -4140 |
| 4 | 124716 |
| 5 | 4755816 |
| 6 | -122371464 |
| 7 | -7639673616 |
| 8 | 161459218320 |
| 9 | 15759163430496 |
| 10 | -257103196917984 |
| 11 | -39679794683308224 |
| 12 | 446329942095824064 |
| 13 | 117908103412902026880 |
| 14 | -696705377356050344064 |
| 15 | -403652886627048369133824 |
| 16 | 107123200040172534149376 |