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 | 11 |
| 3 | -29 |
| 4 | -365 |
| 5 | -1409 |
| 6 | -155 |
| 7 | 29485 |
| 8 | 170035 |
| 9 | 309775 |
| 10 | -2064655 |
| 11 | -18909175 |
| 12 | -61552739 |
| 13 | 81290561 |
| 14 | 1901796395 |
| 15 | 9145986419 |
| 16 | 8604744275 |
| 17 | -165227713249 |
| 18 | -1168032362879 |
| 19 | -2913302013175 |
| 20 | 10702975797545 |
| 21 | 132134872338925 |
| 22 | 519716440255535 |
| 23 | -109051949915065 |
| 24 | -13098011769247075 |