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 | 10000000 |
| 2 | 1280000000 |
| 3 | 21870000000 |
| 4 | 163840000000 |
| 5 | 781250000000 |
| 6 | 2799360000000 |
| 7 | 8235430000000 |
| 8 | 20971520000000 |
| 9 | 47829690000000 |
| 10 | 100000000000000 |
| 11 | 194871710000000 |
| 12 | 358318080000000 |
| 13 | 627485170000000 |