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 | 6 |
| 2 | 30 |
| 3 | 42 |
| 4 | 462 |
| 5 | 6006 |
| 6 | 102102 |
| 7 | 1939938 |
| 8 | 44618574 |
| 9 | 1293938646 |
| 10 | 40112098026 |
| 11 | 1484147626962 |
| 12 | 60850052705442 |
| 13 | 2616552266334006 |
| 14 | 122977956517698282 |
| 15 | 6517831695438008946 |
| 16 | 7255699434544198638 |
| 17 | 442597665507196116918 |
| 18 | 29654043588982139833506 |
| 19 | 2105437094817731928178926 |
| 20 | 153696907921694430757061598 |