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 | 11 |
| 2 | 132 |
| 3 | 1463 |
| 4 | 16104 |
| 5 | 177155 |
| 6 | 1948716 |
| 7 | 21435887 |
| 8 | 235794768 |
| 9 | 2593742459 |
| 10 | 28531167060 |
| 11 | 313842837671 |
| 12 | 3452271214392 |
| 13 | 37974983358323 |
| 14 | 417724816941564 |
| 15 | 4594972986357215 |
| 16 | 50544702849929376 |
| 17 | 555991731349223147 |
| 18 | 6115909044841454628 |
| 19 | 67274999493256000919 |
| 20 | 740024994425816010120 |