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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 10 |
| 5 | 30 |
| 6 | 42 |
| 7 | 210 |
| 8 | 330 |
| 9 | 462 |
| 10 | 2310 |
| 11 | 6090 |
| 12 | 30030 |
| 13 | 66990 |
| 14 | 94710 |
| 15 | 434910 |
| 16 | 651630 |
| 17 | 1292646 |
| 18 | 1610070 |
| 19 | 2478630 |
| 20 | 2497110 |
| 21 | 2916690 |
| 22 | 13220130 |
| 23 | 20930910 |
| 24 | 52582530 |
| 25 | 60690630 |