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) |
|---|---|
| 5 | 2 |
| 6 | 28 |
| 7 | 241 |
| 8 | 1667 |
| 9 | 10142 |
| 10 | 56748 |
| 11 | 299485 |
| 12 | 1514445 |
| 13 | 7415873 |
| 14 | 35424718 |
| 15 | 165963977 |
| 16 | 765639729 |
| 17 | 3488740303 |
| 18 | 15739196772 |
| 19 | 70434524941 |
| 20 | 313136541466 |
| 21 | 1384706596078 |
| 22 | 6096641331963 |
| 23 | 26747810596747 |
| 24 | 117015840972949 |
| 25 | 510745056446585 |
| 26 | 2225207050547044 |
| 27 | 9680854941464722 |