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 | 1 |
| 1 | 50 |
| 2 | 1375 |
| 3 | 27500 |
| 4 | 446875 |
| 5 | 6256250 |
| 6 | 78203125 |
| 7 | 893750000 |
| 8 | 9496093750 |
| 9 | 94960937500 |
| 10 | 902128906250 |
| 11 | 8201171875000 |
| 12 | 71760253906250 |
| 13 | 607202148437500 |
| 14 | 4987731933593750 |
| 15 | 39901855468750000 |
| 16 | 311733245849609375 |
| 17 | 2383842468261718750 |
| 18 | 17878818511962890625 |
| 19 | 131738662719726562500 |