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 | 1 |
| 2 | 126 |
| 3 | 3078 |
| 4 | 32800 |
| 5 | 213750 |
| 6 | 1008126 |
| 7 | 3783976 |
| 8 | 11985408 |
| 9 | 33297075 |
| 10 | 83338750 |
| 11 | 191592126 |
| 12 | 410450976 |
| 13 | 828497488 |
| 14 | 1589341950 |
| 15 | 2917620000 |
| 16 | 5154021376 |
| 17 | 8801526501 |
| 18 | 14585352318 |
| 19 | 23529456550 |
| 20 | 37052820000 |
| 21 | 57089119626 |
| 22 | 86233820926 |
| 23 | 127923156648 |
| 24 | 186649920000 |
| 25 | 268221484375 |
| 26 | 380065968126 |