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 | 6 |
| 3 | 12 |
| 4 | 30 |
| 5 | 60 |
| 6 | 72 |
| 7 | 180 |
| 8 | 192 |
| 9 | 240 |
| 10 | 420 |
| 11 | 432 |
| 12 | 1152 |
| 13 | 2310 |
| 14 | 2592 |
| 15 | 3360 |
| 16 | 6300 |
| 17 | 7560 |
| 18 | 9240 |
| 19 | 15360 |
| 20 | 21600 |
| 21 | 23040 |
| 22 | 26880 |
| 23 | 55440 |
| 24 | 100800 |
| 25 | 110880 |
| 26 | 138240 |
| 27 | 180180 |
| 28 | 241920 |
| 29 | 264600 |
| 30 | 345600 |
| 31 | 415800 |
| 32 | 453600 |
| 33 | 737280 |
| 34 | 786432 |
| 35 | 995328 |
| 36 | 1088640 |
| 37 | 1921920 |
| 38 | 1940400 |
| 39 | 2116800 |
| 40 | 3456000 |