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 | 16 |
| 2 | 240 |
| 3 | 3600 |
| 4 | 54000 |
| 5 | 810000 |
| 6 | 12150000 |
| 7 | 182250000 |
| 8 | 2733750000 |
| 9 | 41006250000 |
| 10 | 615093750000 |
| 11 | 9226406250000 |
| 12 | 138396093750000 |
| 13 | 2075941406250000 |
| 14 | 31139121093750000 |
| 15 | 467086816406250000 |
| 16 | 7006302246093750000 |
| 17 | 105094533691406250000 |
| 18 | 1576418005371093750000 |
| 19 | 23646270080566406250000 |