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 | 0 |
| 2 | 569 |
| 3 | 26676 |
| 4 | 3962734 |
| 5 | 342302244 |
| 6 | 37873593799 |
| 7 | 3704964324320 |
| 8 | 385840008972355 |
| 9 | 38896105985522272 |
| 10 | 3988620629294917699 |
| 11 | 405324462894583579568 |
| 12 | 41388678831664101508625 |
| 13 | 4215380264404938792346540 |
| 14 | 429927047644440948315400804 |
| 15 | 43815601312259648266416292348 |