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 | 936 |
| 7 | 5047 |
| 8 | 42848 |
| 9 | 367929 |
| 10 | 3668500 |
| 11 | 39916811 |
| 12 | 480577032 |
| 13 | 6227020813 |
| 14 | 87197480384 |
| 15 | 1307761815375 |
| 16 | 20923593490816 |
| 17 | 355687428096017 |
| 18 | 6402405005606628 |
| 19 | 121645100408832019 |
| 20 | 2432903231908929800 |
| 21 | 51090944698284691221 |
| 22 | 1124000756238680570272 |