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 | 3 |
| 2 | 15 |
| 3 | 118 |
| 4 | 1317 |
| 5 | 19311 |
| 6 | 352636 |
| 7 | 7722840 |
| 8 | 197354133 |
| 9 | 5764942816 |
| 10 | 189460961985 |
| 11 | 6917588290044 |
| 12 | 277765971072770 |
| 13 | 12163275845132298 |
| 14 | 576793897136731632 |
| 15 | 29444368084753254610 |
| 16 | 1609805318425385690712 |
| 17 | 93843785859803533422675 |