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 | 35 |
| 2 | 700 |
| 3 | 10500 |
| 4 | 131250 |
| 5 | 1443750 |
| 6 | 14437500 |
| 7 | 134062500 |
| 8 | 1173046875 |
| 9 | 9775390625 |
| 10 | 78203125000 |
| 11 | 604296875000 |
| 12 | 4532226562500 |
| 13 | 33120117187500 |
| 14 | 236572265625000 |
| 15 | 1656005859375000 |
| 16 | 11385040283203125 |
| 17 | 77016448974609375 |
| 18 | 513442993164062500 |
| 19 | 3377914428710937500 |