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 | 2500 |
| 3 | 125000 |
| 4 | 6250000 |
| 5 | 312500000 |
| 6 | 15625000000 |
| 7 | 781250000000 |
| 8 | 39062500000000 |
| 9 | 1953125000000000 |
| 10 | 97656250000000000 |
| 11 | 4882812500000000000 |
| 12 | 244140625000000000000 |
| 13 | 12207031250000000000000 |
| 14 | 610351562500000000000000 |
| 15 | 30517578125000000000000000 |
| 16 | 1525878906250000000000000000 |