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 | 263820 |
| 2 | 263940 |
| 3 | 280380 |
| 4 | 280500 |
| 5 | 395730 |
| 6 | 395910 |
| 7 | 420570 |
| 8 | 420750 |
| 9 | 172459210 |
| 10 | 209524210 |
| 11 | 218628662 |
| 12 | 218725430 |
| 13 | 230143790 |
| 14 | 231439570 |
| 15 | 246667790 |
| 16 | 272130250 |
| 17 | 384121920 |
| 18 | 384296640 |
| 19 | 408233280 |
| 20 | 408408000 |