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 | 22 |
| 2 | 462 |
| 3 | 9471 |
| 4 | 194040 |
| 5 | 3973200 |
| 6 | 81355890 |
| 7 | 1665833400 |
| 8 | 34109413800 |
| 9 | 698420207100 |
| 10 | 14300767404000 |
| 11 | 292820775324000 |
| 12 | 5995762611069000 |
| 13 | 122768506573020000 |
| 14 | 2513793020863740000 |
| 15 | 51472120400410710000 |