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 | 14 |
| 3 | 138 |
| 4 | 1686 |
| 5 | 24162 |
| 6 | 394254 |
| 7 | 7191018 |
| 8 | 144786006 |
| 9 | 3188449602 |
| 10 | 76246683534 |
| 11 | 1968284351178 |
| 12 | 54576250392726 |
| 13 | 1618348891438242 |
| 14 | 51122453577462414 |
| 15 | 1714406473587300138 |
| 16 | 60843580566100937046 |
| 17 | 2278637898592632599682 |
| 18 | 89818339421620249242894 |
| 19 | 3717488491001699691500298 |