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) |
|---|---|
| 4 | 1 |
| 5 | 21 |
| 6 | 166 |
| 7 | 1247 |
| 8 | 7855 |
| 9 | 47245 |
| 10 | 284968 |
| 11 | 1741235 |
| 12 | 10782872 |
| 13 | 69537976 |
| 14 | 471717130 |
| 15 | 3336898255 |
| 16 | 24584784957 |
| 17 | 189704257763 |
| 18 | 1530649634720 |
| 19 | 12849873769593 |
| 20 | 111945035887787 |
| 21 | 1011184665775833 |
| 22 | 9458811859041042 |
| 23 | 91480934118104305 |
| 24 | 913112230809837136 |
| 25 | 9391472034599656856 |