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 | 8 |
| 2 | 84 |
| 3 | 1008 |
| 4 | 13090 |
| 5 | 179088 |
| 6 | 2542512 |
| 7 | 37106784 |
| 8 | 553270671 |
| 9 | 8391423040 |
| 10 | 129058047580 |
| 11 | 2008018827360 |
| 12 | 31550226597162 |
| 13 | 499892684834368 |
| 14 | 7978140653296800 |
| 15 | 128138773298754240 |
| 16 | 2069603881026760323 |
| 17 | 33593111381834512200 |
| 18 | 547698081896206040800 |
| 19 | 8965330544164089648000 |
| 20 | 147285313888568167177866 |