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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 52 |
| 5 | 125 |
| 6 | 1626 |
| 7 | 5047 |
| 8 | 81768 |
| 9 | 408249 |
| 10 | 7263910 |
| 11 | 39916811 |
| 12 | 990191676 |
| 13 | 6227020813 |
| 14 | 174356750582 |
| 15 | 1348633786515 |
| 16 | 41861724727696 |
| 17 | 355687428096017 |
| 18 | 12904788209623614 |
| 19 | 121645100408832019 |
| 20 | 4866124222538035620 |
| 21 | 51490090294307945301 |
| 22 | 2248001455555300717294 |