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 | 20 |
| 2 | 1080 |
| 3 | 47059 |
| 4 | 1703178 |
| 5 | 53355889 |
| 6 | 1491827492 |
| 7 | 38051383139 |
| 8 | 899713542225 |
| 9 | 19963535397227 |
| 10 | 419672473818646 |
| 11 | 8421847090410941 |
| 12 | 162325525523034609 |
| 13 | 3020162740527368685 |
| 14 | 54468878788851494328 |
| 15 | 955569173872191005683 |