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 | 15709 |
| 2 | 65281 |
| 3 | 20770621 |
| 4 | 104484601 |
| 5 | 112037185 |
| 6 | 196049701 |
| 7 | 425967301 |
| 8 | 2593182901 |
| 9 | 16923897871 |
| 10 | 32548281361 |
| 11 | 45812984491 |
| 12 | 52035130951 |
| 13 | 55897227751 |
| 14 | 82907336737 |
| 15 | 90003640021 |
| 16 | 92010062101 |
| 17 | 138016057141 |
| 18 | 204082130071 |
| 19 | 310026150211 |
| 20 | 620006892121 |
| 21 | 622333751509 |