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) |
|---|---|
| 2 | 3 |
| 3 | 45 |
| 4 | 637 |
| 5 | 9567 |
| 6 | 156123 |
| 7 | 2781389 |
| 8 | 54043365 |
| 9 | 1141864959 |
| 10 | 26137086451 |
| 11 | 645573913005 |
| 12 | 17138071687053 |
| 13 | 487130581207775 |
| 14 | 14771502665168715 |
| 15 | 476244289169954253 |
| 16 | 16274079501768450421 |
| 17 | 587711952558035789055 |
| 18 | 22370368544174736836835 |
| 19 | 895269564785985107345453 |
| 20 | 37585737112233443277746589 |