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 | 1 |
| 1 | 4 |
| 2 | 31 |
| 3 | 329 |
| 4 | 4316 |
| 5 | 66543 |
| 6 | 1172077 |
| 7 | 23139068 |
| 8 | 504673027 |
| 9 | 12023659317 |
| 10 | 310112290044 |
| 11 | 8596075462411 |
| 12 | 254551364575929 |
| 13 | 8012189624924740 |
| 14 | 266901629110149847 |
| 15 | 9374566215360038977 |
| 16 | 346044223246303101068 |