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 | 0 |
| 2 | 486 |
| 3 | 17496 |
| 4 | 393660 |
| 5 | 7085880 |
| 6 | 111602610 |
| 7 | 1607077584 |
| 8 | 21695547384 |
| 9 | 278942752080 |
| 10 | 3451916556990 |
| 11 | 41422998683880 |
| 12 | 484649084601396 |
| 13 | 5551434969070536 |
| 14 | 62453643402043530 |
| 15 | 691794203838020640 |
| 16 | 7560322370515511280 |
| 17 | 81651481601567521824 |
| 18 | 872650209616752889494 |