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 | 3 |
| 2 | 27 |
| 3 | 63 |
| 4 | 231 |
| 5 | 567 |
| 6 | 1323 |
| 7 | 5103 |
| 8 | 2079 |
| 9 | 4851 |
| 10 | 27783 |
| 11 | 413343 |
| 12 | 13167 |
| 13 | 3720087 |
| 14 | 250047 |
| 15 | 43659 |
| 16 | 100947 |
| 17 | 301327047 |
| 18 | 160083 |
| 19 | 2711943423 |
| 20 | 118503 |
| 21 | 392931 |
| 22 | 20253807 |
| 23 | 219667417263 |
| 24 | 276507 |
| 25 | 2139291 |
| 26 | 182284263 |
| 27 | 1013859 |
| 28 | 1066527 |
| 29 | 160137547184727 |
| 30 | 3361743 |
| 31 | 1441237924662543 |