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 | 1 |
| 2 | 6 |
| 3 | 93 |
| 4 | 2944 |
| 5 | 167685 |
| 6 | 16037376 |
| 7 | 2481455137 |
| 8 | 609371157312 |
| 9 | 235171042752105 |
| 10 | 141778378915235200 |
| 11 | 132871933962627534741 |
| 12 | 192678752056300896500544 |
| 13 | 430404642833695770472870573 |
| 14 | 1474859949355240010986735351872 |
| 15 | 7723091241704594423130951106689225 |