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 | 2 |
| 1 | 5 |
| 2 | 15 |
| 3 | 50 |
| 4 | 175 |
| 5 | 625 |
| 6 | 2250 |
| 7 | 8125 |
| 8 | 29375 |
| 9 | 106250 |
| 10 | 384375 |
| 11 | 1390625 |
| 12 | 5031250 |
| 13 | 18203125 |
| 14 | 65859375 |
| 15 | 238281250 |
| 16 | 862109375 |
| 17 | 3119140625 |
| 18 | 11285156250 |
| 19 | 40830078125 |
| 20 | 147724609375 |
| 21 | 534472656250 |
| 22 | 1933740234375 |
| 23 | 6996337890625 |
| 24 | 25312988281250 |
| 25 | 91583251953125 |