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 | 4 |
| 3 | 6 |
| 4 | 150 |
| 5 | 180 |
| 6 | 240 |
| 7 | 270 |
| 8 | 420 |
| 9 | 570 |
| 10 | 1290 |
| 11 | 1320 |
| 12 | 2310 |
| 13 | 2550 |
| 14 | 2730 |
| 15 | 3360 |
| 16 | 3390 |
| 17 | 4260 |
| 18 | 4650 |
| 19 | 5850 |
| 20 | 5880 |
| 21 | 6360 |
| 22 | 6780 |
| 23 | 9000 |
| 24 | 9240 |
| 25 | 9630 |
| 26 | 10530 |
| 27 | 10890 |
| 28 | 11970 |
| 29 | 13680 |
| 30 | 13830 |
| 31 | 14010 |
| 32 | 14550 |
| 33 | 16230 |
| 34 | 16650 |
| 35 | 18060 |
| 36 | 18120 |
| 37 | 18540 |
| 38 | 19140 |
| 39 | 19380 |
| 40 | 21600 |
| 41 | 21840 |
| 42 | 23370 |