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 | 13 |
| 2 | 49 |
| 3 | 143 |
| 4 | 401 |
| 5 | 1061 |
| 6 | 2763 |
| 7 | 7101 |
| 8 | 18193 |
| 9 | 46575 |
| 10 | 119441 |
| 11 | 307045 |
| 12 | 791499 |
| 13 | 2045725 |