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 | 4 |
| 2 | 25 |
| 3 | 208 |
| 4 | 2152 |
| 5 | 26524 |
| 6 | 378700 |
| 7 | 6142948 |
| 8 | 111593932 |
| 9 | 2244992404 |
| 10 | 49561796380 |
| 11 | 1191625266388 |
| 12 | 31001841211852 |
| 13 | 867899276874964 |
| 14 | 26017959787456060 |
| 15 | 831650920910208628 |
| 16 | 28237504357447540972 |
| 17 | 1014987937635390612724 |