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 | 4 |
| 2 | 14 |
| 3 | 38 |
| 4 | 134 |
| 5 | 254 |
| 6 | 13238 |
| 7 | 252254 |
| 8 | 691958 |
| 9 | 952814 |
| 10 | 3316238 |
| 11 | 30364918838 |
| 12 | 210339665174 |
| 13 | 575167942574 |