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) |
|---|---|
| 1 | 1 |
| 2 | -3 |
| 3 | -8 |
| 4 | -15 |
| 5 | -24 |
| 6 | 576 |
| 7 | -48 |
| 8 | -63 |
| 9 | -80 |
| 10 | 5184 |
| 11 | -120 |
| 12 | 14400 |
| 13 | -168 |
| 14 | 20736 |
| 15 | 36864 |
| 16 | -255 |
| 17 | -288 |
| 18 | 57600 |
| 19 | -360 |
| 20 | 129600 |
| 21 | 147456 |
| 22 | 129600 |
| 23 | -528 |
| 24 | 254016 |
| 25 | -624 |
| 26 | 254016 |
| 27 | -728 |
| 28 | 518400 |
| 29 | -840 |
| 30 | 110075314176 |
| 31 | -960 |
| 32 | -1023 |
| 33 | 921600 |
| 34 | 746496 |
| 35 | 1327104 |
| 36 | 1440000 |
| 37 | -1368 |
| 38 | 1166400 |
| 39 | 1806336 |
| 40 | 2286144 |
| 41 | -1680 |
| 42 | 1761205026816 |
| 43 | -1848 |