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 | 604 |
| 2 | 12281 |
| 3 | 249921 |
| 4 | 5089900 |
| 5 | 103684186 |
| 6 | 2112130109 |
| 7 | 43025963570 |
| 8 | 876479703950 |
| 9 | 17854730951799 |
| 10 | 363717955042320 |
| 11 | 7409282841342444 |
| 12 | 150934183848595064 |
| 13 | 3074673806193093731 |
| 14 | 62634048639412217021 |
| 15 | 1275915526747412367745 |