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 | 512 |
| 2 | 262144 |
| 3 | 10077696 |
| 4 | 134217728 |
| 5 | 1000000000 |
| 6 | 5159780352 |
| 7 | 20661046784 |
| 8 | 68719476736 |
| 9 | 198359290368 |
| 10 | 512000000000 |
| 11 | 1207269217792 |
| 12 | 2641807540224 |
| 13 | 5429503678976 |
| 14 | 10578455953408 |
| 15 | 19683000000000 |
| 16 | 35184372088832 |
| 17 | 60716992766464 |
| 18 | 101559956668416 |
| 19 | 165216101262848 |