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 | 456 |
| 2 | 50328 |
| 3 | -470496 |
| 4 | -21784008 |
| 5 | -234371664 |
| 6 | -1446514848 |
| 7 | -6502690752 |
| 8 | -23328111240 |
| 9 | -71276388312 |
| 10 | -191952331632 |
| 11 | -468159788448 |
| 12 | -1052750026272 |
| 13 | -2212261706256 |
| 14 | -4394299104576 |
| 15 | -8303419066176 |
| 16 | -15060718806024 |
| 17 | -26284654025712 |
| 18 | -44471780630856 |