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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1025 |
| 3 | 88575 |
| 4 | 2097154 |
| 5 | 24414065 |
| 6 | 181398531 |
| 7 | 988663375 |
| 8 | 4294967300 |
| 9 | 15690529809 |
| 10 | 50000000005 |
| 11 | 142655835311 |
| 12 | 371504185350 |
| 13 | 896080197025 |
| 14 | 2024782584839 |
| 15 | 4324877929695 |
| 16 | 8796093022216 |
| 17 | 17135948153825 |