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 | 2217231104 |
| 2 | 6221622528 |
| 3 | 9644780288 |
| 4 | 12127073024 |
| 5 | 15377570560 |
| 6 | 15520617728 |
| 7 | 22426778880 |
| 8 | 43551357696 |
| 9 | 67513462016 |
| 10 | 84107119360 |
| 11 | 84889511168 |
| 12 | 90906475264 |
| 13 | 107642993920 |
| 14 | 156987452160 |
| 15 | 255086523648 |
| 16 | 446676800768 |
| 17 | 497209993984 |
| 18 | 529918233856 |
| 19 | 588749835520 |
| 20 | 636345326848 |