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 | 54 |
| 3 | 2240 |
| 4 | 89964 |
| 5 | 3596725 |
| 6 | 143700480 |
| 7 | 5740732439 |
| 8 | 229334969304 |
| 9 | 9161621922880 |
| 10 | 365994298083150 |
| 11 | 14620972301965259 |
| 12 | 584087869159280640 |
| 13 | 23333512405041243469 |
| 14 | 932141942728566562746 |
| 15 | 37237797134599264280000 |
| 16 | 1487599121840339002010544 |
| 17 | 59427552583207598523644161 |