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 | 0 |
| 1 | 0 |
| 2 | 10 |
| 3 | 378 |
| 4 | 7048 |
| 5 | 96000 |
| 6 | 1092460 |
| 7 | 11060700 |
| 8 | 103150528 |
| 9 | 905077728 |
| 10 | 7576640950 |
| 11 | 61098854454 |
| 12 | 477942694136 |
| 13 | 3645484792560 |
| 14 | 27220292840440 |
| 15 | 199588002587160 |
| 16 | 1440630859132416 |
| 17 | 10256896070590464 |
| 18 | 72150109176698562 |
| 19 | 502120765832371602 |
| 20 | 3461203073248719400 |
| 21 | 23654601049848668256 |