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 | 0 |
| 1 | 7 |
| 2 | 180 |
| 3 | 1625 |
| 4 | 16936 |
| 5 | 157279 |
| 6 | 1426734 |
| 7 | 12582472 |
| 8 | 108971358 |
| 9 | 929801662 |
| 10 | 7842704798 |
| 11 | 65526395993 |
| 12 | 543197940936 |
| 13 | 4473218574611 |
| 14 | 36628689696182 |
| 15 | 298465716569236 |
| 16 | 2421637058537566 |
| 17 | 19574314969125483 |
| 18 | 157692516088571216 |
| 19 | 1266593481935599039 |
| 20 | 10146033357194978996 |