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 | 0 |
| 1 | 7 |
| 2 | 25 |
| 3 | 155 |
| 4 | 1195 |
| 5 | 10282 |
| 6 | 94591 |
| 7 | 910480 |
| 8 | 9054965 |
| 9 | 92310075 |
| 10 | 959473878 |
| 11 | 10129715890 |
| 12 | 108327387675 |
| 13 | 1170975480360 |
| 14 | 12773887368040 |
| 15 | 140445927510832 |
| 16 | 1554748206904325 |
| 17 | 17314584431331025 |
| 18 | 193849445090545875 |
| 19 | 2180550929942519685 |
| 20 | 24632294533221865028 |