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 | 1 |
| 2 | 2 |
| 3 | 9 |
| 4 | 18 |
| 5 | 1025 |
| 6 | 74 |
| 7 | 279937 |
| 8 | 65554 |
| 9 | 10077705 |
| 10 | 1049602 |
| 11 | 100000000001 |
| 12 | 16777306 |
| 13 | 106993205379073 |
| 14 | 78364444034 |
| 15 | 35184372089865 |
| 16 | 281474976776210 |
| 17 | 295147905179352825857 |
| 18 | 101559966746186 |
| 19 | 708235345355337676357633 |
| 20 | 1152921504607896594 |
| 21 | 46005119909369701746057 |
| 22 | 10000000000100000000002 |