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) |
|---|---|
| 1 | 0 |
| 2 | 100 |
| 3 | 2250 |
| 4 | 30000 |
| 5 | 312500 |
| 6 | 2812500 |
| 7 | 22968750 |
| 8 | 175000000 |
| 9 | 1265625000 |
| 10 | 8789062500 |
| 11 | 59082031250 |
| 12 | 386718750000 |
| 13 | 2475585937500 |
| 14 | 15551757812500 |
| 15 | 96130371093750 |
| 16 | 585937500000000 |
| 17 | 3527832031250000 |
| 18 | 21011352539062500 |