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 | 10 |
| 2 | 280 |
| 3 | 7840 |
| 4 | 219520 |
| 5 | 6146560 |
| 6 | 172103680 |
| 7 | 4818903040 |
| 8 | 134929285120 |
| 9 | 3778019983360 |
| 10 | 105784559534080 |
| 11 | 2961967666954240 |
| 12 | 82935094674718720 |
| 13 | 2322182650892124160 |
| 14 | 65021114224979476480 |
| 15 | 1820591198299425341440 |