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 | 40 |
| 5 | 125 |
| 6 | 1056 |
| 7 | 5047 |
| 8 | 51248 |
| 9 | 383049 |
| 10 | 4364020 |
| 11 | 39916811 |
| 12 | 576885552 |
| 13 | 6227020813 |
| 14 | 99634224704 |
| 15 | 1334500527375 |
| 16 | 23592657488416 |
| 17 | 355687428096017 |
| 18 | 7202890599354468 |
| 19 | 121645100408832019 |
| 20 | 2679832071577681040 |
| 21 | 51612375654647808021 |
| 22 | 1226182612423511392672 |