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 | 2 |
| 2 | 4 |
| 3 | 11 |
| 4 | 46 |
| 5 | 302 |
| 6 | 3109 |
| 7 | 49345 |
| 8 | 1209058 |
| 9 | 45574112 |
| 10 | 2636237374 |
| 11 | 234854695297 |
| 12 | 32081882854399 |
| 13 | 6733481882732516 |
| 14 | 2172532761103119601 |
| 15 | 1074257501384373622001 |
| 16 | 816914977299535380309346 |
| 17 | 953227711986515337529688144 |
| 18 | 1706089496424625166250326935690 |