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 | 132 |
| 2 | 18216 |
| 3 | 2550240 |
| 4 | 359583840 |
| 5 | 50917071744 |
| 6 | 7230224187648 |
| 7 | 1028757612985344 |
| 8 | 146597959850411520 |
| 9 | 20914642271992043520 |
| 10 | 2986610916440463814656 |
| 11 | 426813850967673556058112 |
| 12 | 61034380688377318516310016 |
| 13 | 8732611390798600956948971520 |
| 14 | 1250010944797171165551838494720 |