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 | 12 |
| 3 | 132 |
| 4 | 1392 |
| 5 | 14348 |
| 6 | 146424 |
| 7 | 1488108 |
| 8 | 15083740 |
| 9 | 152484278 |
| 10 | 1537437464 |
| 11 | 15465605806 |
| 12 | 155275855726 |
| 13 | 1556493430588 |