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 | 400 |
| 3 | 4792 |
| 4 | 51800 |
| 5 | 607043 |
| 6 | 7354488 |
| 7 | 88342972 |
| 8 | 1052865902 |
| 9 | 12550021410 |
| 10 | 149829237791 |
| 11 | 1789228772267 |
| 12 | 21361035307546 |
| 13 | 254996432939040 |
| 14 | 3044109171852296 |
| 15 | 36341089959264948 |
| 16 | 433845306322806048 |