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 | 18 |
| 2 | 1350 |
| 3 | 141120 |
| 4 | 17151750 |
| 5 | 2272538268 |
| 6 | 318430816704 |
| 7 | 46404203788800 |
| 8 | 6961609406993670 |
| 9 | 1068002895589987500 |
| 10 | 166779781860762170100 |
| 11 | 26422986893371642828800 |
| 12 | 4236593267629481817240000 |
| 13 | 686167053247777413372681600 |
| 14 | 112093956900827388909570240000 |