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 | 12 |
| 2 | 132 |
| 3 | 1404 |
| 4 | 14700 |
| 5 | 152532 |
| 6 | 1573716 |
| 7 | 16172148 |
| 8 | 165697044 |
| 9 | 1693773924 |
| 10 | 17281929564 |
| 11 | 176064704412 |
| 12 | 1791455071068 |
| 13 | 18208650297396 |
| 14 | 184907370618612 |
| 15 | 1876240018679868 |
| 16 | 19024942249966812 |
| 17 | 192794447005403916 |
| 18 | 1952681556794601732 |
| 19 | 19767824914170222996 |