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 | 0 |
| 2 | 144 |
| 3 | 2784 |
| 4 | 57552 |
| 5 | 1180320 |
| 6 | 23889936 |
| 7 | 480221280 |
| 8 | 9624275280 |
| 9 | 192645717024 |
| 10 | 3854200280208 |
| 11 | 77094305873376 |
| 12 | 1541968557881808 |
| 13 | 30840030795738528 |
| 14 | 616805893363960080 |
| 15 | 12336160087905835872 |
| 16 | 246723539526229152336 |
| 17 | 4934473492678780614432 |
| 18 | 98689491470837087102352 |