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) |
|---|---|
| 1 | 1 |
| 2 | 344 |
| 3 | 22296 |
| 4 | 615000 |
| 5 | 9876000 |
| 6 | 108487128 |
| 7 | 897376152 |
| 8 | 5950405848 |
| 9 | 33031486875 |
| 10 | 158406862000 |
| 11 | 671944398512 |
| 12 | 2567519091888 |
| 13 | 8965083682032 |
| 14 | 28938181326000 |
| 15 | 87168786702000 |
| 16 | 246953567853744 |
| 17 | 662331582918141 |
| 18 | 1691011474896264 |
| 19 | 4129363811437000 |
| 20 | 9684000822437000 |