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) |
|---|---|
| 3 | 1 |
| 4 | 8 |
| 5 | 46 |
| 6 | 233 |
| 7 | 1108 |
| 8 | 5083 |
| 9 | 22805 |
| 10 | 100827 |
| 11 | 441311 |
| 12 | 1917751 |
| 13 | 8289965 |
| 14 | 35694218 |
| 15 | 153225617 |
| 16 | 656213596 |
| 17 | 2805143526 |
| 18 | 11973556060 |
| 19 | 51047361676 |
| 20 | 217420991444 |
| 21 | 925300665762 |
| 22 | 3935293406942 |
| 23 | 16727533586006 |
| 24 | 71069911887898 |
| 25 | 301835332909216 |