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 | 1 |
| 2 | 42 |
| 3 | 1723 |
| 4 | 70644 |
| 5 | 2896405 |
| 6 | 118752606 |
| 7 | 4868856847 |
| 8 | 199623130728 |
| 9 | 8184548359849 |
| 10 | 335566482753810 |
| 11 | 13758225792906211 |
| 12 | 564087257509154652 |
| 13 | 23127577557875340733 |
| 14 | 948230679872888970054 |
| 15 | 38877457874788447772215 |
| 16 | 1593975772866326358660816 |
| 17 | 65353006687519380705093457 |