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 | 10 |
| 2 | 150 |
| 3 | 1500 |
| 4 | 12500 |
| 5 | 93750 |
| 6 | 656250 |
| 7 | 4375000 |
| 8 | 28125000 |
| 9 | 175781250 |
| 10 | 1074218750 |
| 11 | 6445312500 |
| 12 | 38085937500 |
| 13 | 222167968750 |
| 14 | 1281738281250 |
| 15 | 7324218750000 |
| 16 | 41503906250000 |
| 17 | 233459472656250 |
| 18 | 1304626464843750 |
| 19 | 7247924804687500 |