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 | 6 |
| 1 | 56 |
| 2 | 1050 |
| 3 | 25112 |
| 4 | 655746 |
| 5 | 17766056 |
| 6 | 489541650 |
| 7 | 13599182072 |
| 8 | 379283617986 |
| 9 | 10599157616456 |
| 10 | 296486304875250 |
| 11 | 8297561014164632 |
| 12 | 232274972859656226 |
| 13 | 6502905234227329256 |
| 14 | 182070232515259616850 |
| 15 | 5097810928082584052792 |