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 | 37 |
| 3 | 125 |
| 4 | 149 |
| 5 | 809 |
| 6 | 2749 |
| 7 | 299737 |
| 8 | 386425 |
| 9 | 11999605 |
| 10 | 234651157 |
| 11 | 408736241 |
| 12 | 6774999061 |
| 13 | 64022229925 |
| 14 | 1908639461677 |
| 15 | 1335895366969 |
| 16 | 9096838161305 |
| 17 | 21628618328809 |
| 18 | 143957700194557 |
| 19 | 11333535286711093 |
| 20 | 377268327596543125 |