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 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 317 |
| 5 | 7581 |
| 6 | 272914 |
| 7 | 13975298 |
| 8 | 981599065 |
| 9 | 92344174075 |
| 10 | 11474433841581 |
| 11 | 1869937363283342 |
| 12 | 398202456366104555 |
| 13 | 110561615797436467938 |
| 14 | 39978343388337757968279 |
| 15 | 18814183279605303823720601 |