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 | 1 |
| 1 | 9 |
| 2 | 75 |
| 3 | 763 |
| 4 | 9495 |
| 5 | 140151 |
| 6 | 2390479 |
| 7 | 46206735 |
| 8 | 997313823 |
| 9 | 23758664095 |
| 10 | 618884638911 |
| 11 | 17492190577599 |
| 12 | 532985208200575 |
| 13 | 17411277367391103 |
| 14 | 606917269909048575 |
| 15 | 22481059424730751231 |
| 16 | 881687990282453393919 |