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 | 691 |
| 1 | 563040 |
| 2 | 305307360 |
| 3 | 131729109120 |
| 4 | 34085393629920 |
| 5 | 4587384326495040 |
| 6 | 302027782271806080 |
| 7 | 10484303481804821760 |
| 8 | 226150164335242994400 |
| 9 | 3395290157453914541280 |
| 10 | 38308806132696980919360 |
| 11 | 343030311387007824977280 |
| 12 | 2537869275676057371269760 |