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 | 3 |
| 2 | 10 |
| 3 | 35 |
| 4 | 125 |
| 5 | 450 |
| 6 | 1625 |
| 7 | 5875 |
| 8 | 21250 |
| 9 | 76875 |
| 10 | 278125 |
| 11 | 1006250 |
| 12 | 3640625 |
| 13 | 13171875 |
| 14 | 47656250 |
| 15 | 172421875 |
| 16 | 623828125 |
| 17 | 2257031250 |
| 18 | 8166015625 |
| 19 | 29544921875 |
| 20 | 106894531250 |
| 21 | 386748046875 |
| 22 | 1399267578125 |
| 23 | 5062597656250 |
| 24 | 18316650390625 |
| 25 | 66270263671875 |
| 26 | 239768066406250 |