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 | 137 |
| 3 | 2351 |
| 4 | 29075 |
| 5 | 408429 |
| 6 | 5957562 |
| 7 | 76590384 |
| 8 | 955079422 |
| 9 | 11831378688 |
| 10 | 142650905559 |
| 11 | 1668991927795 |
| 12 | 19144774189917 |
| 13 | 215790313316371 |
| 14 | 2388025355854986 |
| 15 | 25973791505651972 |
| 16 | 278176027053878678 |
| 17 | 2936495245822593766 |
| 18 | 30573379794788083289 |
| 19 | 314185573464039742503 |