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 | 1600 |
| 2 | 20000 |
| 3 | 250000 |
| 4 | 1750000 |
| 5 | 12250000 |
| 6 | 60025000 |
| 7 | 294122500 |
| 8 | 1129430400 |
| 9 | 4337012736 |
| 10 | 13940398080 |
| 11 | 44808422400 |
| 12 | 125737920000 |
| 13 | 352836000000 |
| 14 | 889440750000 |
| 15 | 2242131890625 |
| 16 | 5181815925000 |
| 17 | 11975752360000 |
| 18 | 25758754621600 |