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 | 401120980260 |
| 3 | 360360 |
| 4 | 55440 |
| 5 | 110880 |
| 6 | 100800 |
| 7 | 120960 |
| 8 | 241920 |
| 9 | 483840 |
| 10 | 967680 |
| 11 | 1935360 |
| 12 | 3870720 |
| 13 | 7741440 |
| 14 | 15482880 |
| 15 | 30965760 |
| 16 | 61931520 |
| 17 | 123863040 |
| 18 | 247726080 |
| 19 | 495452160 |
| 20 | 990904320 |
| 21 | 1981808640 |
| 22 | 3963617280 |
| 23 | 7927234560 |
| 24 | 15854469120 |
| 25 | 31708938240 |
| 26 | 63417876480 |
| 27 | 126835752960 |