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 | 60 |
| 4 | 420 |
| 5 | 2730 |
| 6 | 8970 |
| 7 | 11970 |
| 8 | 21840 |
| 9 | 28620 |
| 10 | 29130 |
| 11 | 44130 |
| 12 | 48120 |
| 13 | 55050 |
| 14 | 56100 |
| 15 | 61980 |
| 16 | 74160 |
| 17 | 84390 |
| 18 | 87540 |
| 19 | 111270 |
| 20 | 111870 |
| 21 | 143880 |
| 22 | 176550 |
| 23 | 191670 |
| 24 | 207510 |
| 25 | 227610 |
| 26 | 229590 |
| 27 | 233550 |
| 28 | 251220 |
| 29 | 258330 |
| 30 | 281580 |
| 31 | 324450 |
| 32 | 343770 |
| 33 | 356820 |
| 34 | 390000 |