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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 18 |
| 4 | 60 |
| 5 | 150 |
| 6 | 210 |
| 7 | 420 |
| 8 | 390 |
| 9 | 840 |
| 10 | 7770 |
| 11 | 5460 |
| 12 | 9282 |
| 13 | 2310 |
| 14 | 3570 |
| 15 | 2730 |
| 16 | 10710 |
| 17 | 39270 |
| 18 | 117810 |
| 19 | 60060 |
| 20 | 154770 |
| 21 | 43890 |
| 22 | 53130 |
| 23 | 46410 |
| 24 | 66990 |
| 25 | 62790 |
| 26 | 176358 |
| 27 | 106260 |
| 28 | 30030 |
| 29 | 642180 |
| 30 | 1111110 |
| 31 | 1919190 |
| 32 | 930930 |
| 33 | 1688610 |
| 34 | 1360590 |
| 35 | 1531530 |
| 36 | 1291290 |
| 37 | 570570 |
| 38 | 1138830 |
| 39 | 510510 |
| 40 | 690690 |
| 41 | 1141140 |
| 42 | 870870 |